187.121.0.0/17

AS19182  ·  TELEFÔNICA BRASIL S.A

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Summary

Country Brazil
Domain telefonica.com.br
ASN AS19182
Registry LACNIC
ID ART8

WHOIS Details

inetnum:     187.121.0.0/17
aut-num:     AS19182
abuse-c:     CSTBR
owner:       TELEF�NICA BRASIL S.A
ownerid:     02.558.157/0001-62
responsible: Diretoria de Planejamento e Tecnologia
owner-c:     ARITE
tech-c:      ARITE
inetrev:     187.121.0.0/20
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.16.0/21
nserver:     aquarius.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     lynx.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     hercules.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     orion.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
inetrev:     187.121.24.0/22
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.28.0/22
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.32.0/22
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.36.0/23
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.38.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     lynx.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     hercules.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     orion.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
inetrev:     187.121.39.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.40.0/21
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.48.0/21
nserver:     aquarius.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     lynx.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     hercules.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     orion.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
inetrev:     187.121.56.0/22
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.60.0/23
nserver:     aquarius.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     lynx.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     hercules.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     orion.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
inetrev:     187.121.62.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.63.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     lynx.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     hercules.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     orion.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
inetrev:     187.121.64.0/22
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.68.0/23
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.70.0/23
nserver:     aquarius.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     lynx.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     hercules.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     orion.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
inetrev:     187.121.72.0/21
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.80.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.81.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.82.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     lynx.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     hercules.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     orion.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
inetrev:     187.121.83.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.84.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.85.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.86.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.87.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.88.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.89.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.90.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     lynx.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     hercules.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     orion.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
inetrev:     187.121.91.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     lynx.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     hercules.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     orion.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
inetrev:     187.121.92.0/23
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.94.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     lynx.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     hercules.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     orion.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
inetrev:     187.121.95.0/24
nserver:     aquarius.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     lynx.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     hercules.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     orion.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
inetrev:     187.121.96.0/21
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.104.0/22
nserver:     aquarius.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     lynx.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     hercules.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
nserver:     orion.vivo.com.br
nsstat:      20240117 AA
nslastaa:    20240117
inetrev:     187.121.108.0/22
nserver:     aquarius.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     lynx.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     hercules.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     orion.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
inetrev:     187.121.112.0/20
nserver:     aquarius.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     lynx.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     hercules.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
nserver:     orion.vivo.com.br
nsstat:      20240118 AA
nslastaa:    20240118
created:     20100223
changed:     20131114

nic-hdl-br:  ARITE
person:      Administra��o Rede IP Telesp
created:     20080407
changed:     20230629

nic-hdl-br:  CSTBR
person:      CSIRT TELEFONICA BR
created:     20180713
changed:     20180713

Nearby Ranges

BGP prefixes that overlap with 187.121.0.0/16

Range ASN Company Num of IPs
187.121.192.0/19 AS28667 VERO S.A 8,192
187.121.160.0/20 AS270814 ZAAZ PROVEDOR DE INTERNET E TELECOMUNICACOES LTDA 4,096
187.121.176.0/20 AS28343 UNIFIQUE TELECOMUNICACOES S/A 4,096
187.121.144.0/21 AS273683 ALLREDE TELECOM LTDA 2,048
187.121.224.0/21 AS266356 PRONTO FIBRA LTDA 2,048
187.121.232.0/22 AS264119 UBA CONECT TELECOM LTDA - ME 1,024
187.121.156.0/22 AS270918 INSIDE TECNOLOGIA E SERVIÇOS LTDA 1,024
187.121.152.0/22 AS270921 CROSS CONNECT PROVEDOR 1,024
187.121.236.0/22 AS265369 C-ComTelecom Servios Ltda-ME 1,024

Hosted domains

There are 5 domain names hosted across 5 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
187.121.29.134 v2-labs.io 1
187.121.27.180 iharaleone.com 1
187.121.36.171 populim.com 1
187.121.42.180 martinsautosocorro.com.br 1
187.121.116.168 abdallabernardes.com 1

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.
Useful for Cybersecurity

Pingable IPs

6,157 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
187.121.18.71 AS19182 TELEFÔNICA BRASIL S.A 2.88ms from Osasco, BR
187.121.101.249 AS19182 TELEFÔNICA BRASIL S.A 4.40ms from Osasco, BR
187.121.105.58 AS19182 TELEFÔNICA BRASIL S.A 3.18ms from Osasco, BR
187.121.84.59 AS19182 TELEFÔNICA BRASIL S.A 1.95ms from Osasco, BR
187.121.34.223 AS19182 TELEFÔNICA BRASIL S.A 5.41ms from São Paulo, BR
187.121.11.59 AS19182 TELEFÔNICA BRASIL S.A 2.61ms from Osasco, BR
187.121.28.126 AS19182 TELEFÔNICA BRASIL S.A 3.80ms from Osasco, BR
187.121.79.85 AS19182 TELEFÔNICA BRASIL S.A 2.08ms from Osasco, BR
187.121.74.110 AS19182 TELEFÔNICA BRASIL S.A 5.40ms from Sao Paulo, BR
187.121.86.198 AS19182 TELEFÔNICA BRASIL S.A 2.12ms from Osasco, BR
187.121.85.46 AS19182 TELEFÔNICA BRASIL S.A 2.00ms from Osasco, BR
187.121.78.44 AS19182 TELEFÔNICA BRASIL S.A 2.07ms from Osasco, BR
187.121.65.95 AS19182 TELEFÔNICA BRASIL S.A 4.89ms from Sao Paulo, BR
187.121.70.188 AS19182 TELEFÔNICA BRASIL S.A 8.96ms from São Paulo, BR
187.121.83.107 AS19182 TELEFÔNICA BRASIL S.A 2.09ms from Osasco, BR
187.121.76.191 AS19182 TELEFÔNICA BRASIL S.A 5.30ms from Osasco, BR
187.121.56.29 AS19182 TELEFÔNICA BRASIL S.A 1.60ms from Osasco, BR
187.121.69.29 AS19182 TELEFÔNICA BRASIL S.A 8.71ms from Sao Paulo, BR
187.121.67.1 AS19182 TELEFÔNICA BRASIL S.A 9.24ms from Sao Paulo, BR
187.121.108.128 AS19182 TELEFÔNICA BRASIL S.A 7.49ms from Osasco, BR
187.121.109.204 AS19182 TELEFÔNICA BRASIL S.A 7.67ms from Osasco, BR
187.121.99.169 AS19182 TELEFÔNICA BRASIL S.A 3.14ms from Osasco, BR
187.121.81.246 AS19182 TELEFÔNICA BRASIL S.A 2.08ms from Osasco, BR
187.121.4.134 AS19182 TELEFÔNICA BRASIL S.A 2.56ms from Sao Paulo, BR
187.121.127.1 AS19182 TELEFÔNICA BRASIL S.A 9.25ms from Osasco, BR

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address ASN Details
89.98.252.1 AS33915 Vodafone Libertel B.V. 3.56ms from Amsterdam, NL
67.59.153.1 AS20021 Ntirety, Inc. 4.95ms from Ashburn, US
216.207.18.49 AS209 CenturyLink Communications, LLC 7.99ms from Ashburn, US
94.68.95.193 AS6799 Ote SA (Hellenic Telecommunications Organisation) 8.94ms from Athens, GR
64.203.248.145 AS22646 Hargray Communications Group, Inc. 0.65ms from Atlanta, US
89.23.77.1 AS9125 Drustvo za telekomunikacije Orion telekom doo Beograd-Zemun 1.15ms from Belgrade, RS
62.121.86.1 AS12302 Vodafone Romania S.A. 1.43ms from Bucharest, RO
186.127.211.1 AS7303 Telecom Argentina S.A. 1.46ms from Buenos Aires, AR
191.97.211.1 AS7303 Telecom Argentina S.A. 6.41ms from Buenos Aires, AR
190.192.177.1 AS7303 Telecom Argentina S.A. 1.29ms from Buenos Aires, AR
175.16.148.1 AS4837 CHINA UNICOM China169 Backbone 2.48ms from Changchun, CN
173.242.82.193 AS36001 Bertram Communications LLC 6.11ms from Chicago, US
68.50.46.1 AS7922 Comcast Cable Communications, LLC 10.04ms from Chicago, US
73.73.228.1 AS7922 Comcast Cable Communications, LLC 2.31ms from Chicago, US
107.207.200.1 AS7018 AT&T Enterprises, LLC 6.24ms from Columbus, US
181.4.4.1 AS7303 Telecom Argentina S.A. 0.55ms from Cordoba, AR
172.110.152.241 AS19740 Sudjam, LLC 0.18ms from Dallas, US
34.244.168.129 AS16509 Amazon.com, Inc. 0.57ms from Dublin, IE
189.43.224.49 AS4230 CLARO S.A. 11.63ms from Fortaleza, BR
177.12.100.1 AS53118 NETLINE TELECOM 7.29ms from Fortaleza, BR
217.92.15.241 AS3320 Deutsche Telekom AG 6.38ms from Frankfurt am Main, DE
162.248.224.1 AS14576 Hosting Solution Ltd. 0.47ms from Fremont, US
113.117.24.1 AS4134 CHINANET-BACKBONE 10.18ms from Guangzhou, CN
192.194.116.113 AS1759 Telia Finland Oyj 0.81ms from Helsinki, FI
203.210.7.65 AS38819 HKCSL GPRS NETWORK 0.77ms from Hong Kong, HK

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.

$
traceroute -a -n -q1 -f2 187.121.10.1
traceroute to 187.121.10.1 (187.121.10.1): 64 hops max, 52 byte packets
2 [AS53340] 192.228.109.93 382.213 ms
3 [AS53667] 198.251.87.1 0.293 ms
4 *
5 *
6 *
7 *
9 *
10 [AS12956] 213.140.36.35 160.297 ms
11 *
12 *
13 [AS26599] 179.88.0.60 168.101 ms
14 [AS26599] 179.88.1.13 167.467 ms
15 *
16 [AS19182] 187.121.10.1 167.757 ms
Measurement taken from IPinfo ProbeNet in Las Vegas, US
On

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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