81.90.168.0/21

AS5610 · O2 Czech Republic, a.s.

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Summary

Country	Czechia
Domain	o2.cz
ASN	AS5610
Parent Range	81.90.160.0/20
Registry	RIPE
ID	CZ-CZNET-20020704

WHOIS Details

inetnum:        81.90.160.0 - 81.90.175.255
netname:        CZ-CZNET-20020704
country:        CZ
org:            ORG-STaN1-RIPE
admin-c:        CZO2-RIPE
admin-c:        VAKO1-RIPE
tech-c:         CZO2-RIPE
tech-c:         VAKO1-RIPE
status:         ALLOCATED PA
notify:         reg@telecom.cz
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         AS5610-MTN
mnt-lower:      AS5610-MTN
mnt-routes:     AS5610-MTN
mnt-domains:    AS5610-MTN
created:        2017-11-14T08:41:09Z
last-modified:  2018-12-18T08:17:57Z
source:         RIPE
abuse-email:    abuse@o2.cz
abuse-c:        AR14410-RIPE
abuse-org:      ORG-STaN1-RIPE

organisation:   ORG-STaN1-RIPE
org-name:       O2 Czech Republic, a.s.
country:        CZ
org-type:       LIR
address:        Za Brumlovkou 266/2
address:        140 22
address:        Praha 4 - Michle
address:        CZECH REPUBLIC
phone:          +420 2 71466184
fax-no:         +420 2 71464414
e-mail:         marek.vogel@o2.cz
admin-c:        VAKO1-RIPE
admin-c:        MV96-RIPE
admin-c:        HVJI1-RIPE
tech-c:         CZO2-RIPE
abuse-c:        AR14410-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        AS5610-MTN
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         AS5610-MTN
created:        2004-04-17T11:04:17Z
last-modified:  2020-12-16T12:31:56Z
source:         RIPE

role:           5610-Tech-and-Admin
address:        Za Brumlovkou 266/2
address:        Praha 4 - Michle, PSC 140 22
e-mail:         router@o2.cz
nic-hdl:        CZO2-RIPE
admin-c:        VAKO1-RIPE
admin-c:        MV96-RIPE
admin-c:        HVJI1-RIPE
tech-c:         VAKO1-RIPE
tech-c:         HVJI1-RIPE
abuse-mailbox:  abuse@o2.cz
org:            ORG-STaN1-RIPE
mnt-by:         AS5610-MTN
created:        2016-02-18T09:58:30Z
last-modified:  2018-04-20T10:44:21Z
source:         RIPE

person:         Vaclav Kordula
address:        O2 Czech Republic, a.s.
address:        Za Brumlovkou 266/2
address:        Praha 4 - Michle, PS? 140 22
address:        Czech Republic
phone:          +420 2 714668845
e-mail:         vaclav.kordula@o2.cz
nic-hdl:        VAKO1-RIPE
notify:         vaclav.kordula@o2.cz
mnt-by:         AS5610-MTN
created:        1970-01-01T00:00:00Z
last-modified:  2016-02-12T13:32:30Z
source:         RIPE

route:          81.90.160.0/20
descr:          O2 InternetHome TermsNet
origin:         AS5610
mnt-by:         AS5610-MTN
created:        2016-11-15T14:13:09Z
last-modified:  2016-11-15T14:13:09Z
source:         RIPE

Overlapping Ranges

BGP prefixes that contain 81.90.168.0/21

Range	ASN	Company	Num of IPs
81.90.160.0/20	AS5610	O2 Czech Republic, a.s.	4,096

BGP prefixes that are contained by 81.90.168.0/21

Range	ASN	Company	Num of IPs
81.90.168.0/24	AS5610	Elsat spol. s r.o.	256

Nearby Ranges

BGP prefixes that overlap with 81.90.0.0/16

Range	ASN	Company	Num of IPs
81.90.0.0/20	AS12739	JSC Netline	4,096
81.90.48.0/20	AS29003	IP TELECOM, SERVICOS DE TELECOMUNICACOES S.A.	4,096
81.90.80.0/20	AS29646	FFastfill UK Limited	4,096
81.90.240.0/20	AS39761	ABAK, Co.Ltd.	4,096
81.90.208.0/20	AS39775	Limited Liability Company HyperNet	4,096
81.90.192.0/20	AS39835	goetel GmbH	4,096
81.90.128.0/20	AS48901	DSNET Ltd	4,096
81.90.64.0/20	AS15830	Equinix (Finland) Oy	4,096
81.90.32.0/20	AS25058	CMO Internet Dienstleistungen GmbH	4,096
81.90.224.0/20	AS25071	RadioCom Ltd	4,096
81.90.112.0/20	AS2586	Elisa Eesti AS	4,096
81.90.160.0/20	AS5610	O2 Czech Republic, a.s.	4,096
81.90.128.0/20	AS25048	DSNET Ltd	4,096
81.90.180.0/22	AS50340	Kokunov Evgeny Andreevich	1,024
81.90.168.0/24	AS5610	Elsat spol. s r.o.	256
81.90.190.0/24	AS9009	Think Huge Ltd	256
81.90.191.0/24	AS199967	Think Huge Ltd	256
81.90.30.0/24	AS201664	NetWarm LTD	256
81.90.25.0/24	AS207567	intezio	256
81.90.28.0/24	AS207567	Frankfurt, Germany	256
81.90.31.0/24	AS207713	GLOBAL INTERNET SOLUTIONS LLC	256
81.90.188.0/24	AS212238	Think Huge Ltd	256
81.90.189.0/24	AS212238	Think Huge Ltd	256
81.90.29.0/24	AS215540	GLOBAL CONNECTIVITY SOLUTIONS LLP	256
81.90.133.0/24	AS25048	DSNet Ltd	256
81.90.237.0/24	AS25071	ISP RadioCom	256
81.90.134.0/24	AS48901	Office	256
81.90.136.0/24	AS48901	Office	256
81.90.137.0/24	AS48901	Office	256

Hosted domains

There are 9 domain names hosted across 4 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP

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

Read more

Pingable IPs

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

IP Address	ASN	Details
81.90.170.67	AS5610 O2 Czech Republic, a.s.	`2.68ms` from Prague, CZ
81.90.173.5	AS5610 O2 Czech Republic, a.s.	`3.51ms` from Prague, CZ
81.90.168.82	AS5610 O2 Czech Republic, a.s.	`2.67ms` from Prague, CZ

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
178.248.228.21	AS51149 Sinch AB	`0.60ms` from Aubervilliers, FR
71.235.244.5	AS7922 Comcast Cable Communications, LLC	`6.05ms` from Boston, US
105.197.29.69	AS24835 Vodafone Data	`11.40ms` from Cairo, EG
99.23.15.213	AS7018 AT&T Enterprises, LLC	`4.89ms` from Chicago, US
83.138.11.53	AS30900 Sternforth Ltd. trading as WebWorld	`0.37ms` from Dublin, IE
203.229.51.117	AS9689 SK Broadband Co Ltd	`1.84ms` from Incheon, KR
150.244.88.53	AS766 RedIRIS Autonomous System	`2.33ms` from Madrid, ES
73.205.133.69	AS7922 Comcast Cable Communications, LLC	`4.71ms` from Miami, US
170.158.251.101	AS46158 OCM BOCES	`15.14ms` from New York City, US
191.180.160.69	AS28573 Claro NXT Telecomunicacoes Ltda	`6.49ms` from Osasco, BR
159.100.136.5	AS13768 Aptum Technologies	`0.33ms` from Portsmouth, GB
142.202.50.21	AS63023 GTHost	`0.07ms` from Seattle, US
66.79.242.213	AS11666 Nexicom Inc.	`1.95ms` from Toronto, CA
178.238.249.5	AS197201 Spoldzielnia Mieszkaniowa Lokatorsko-Wlasnosciowa SLOWIANIN	`14.60ms` from Warsaw, PL
51.154.137.133	AS15796 Salt Mobile SA	`1.09ms` from Zuerich, CH
68.229.106.197	AS22773 Cox Communications Inc.	`9.68ms` from Ashburn, US
3.103.93.101	AS16509 Amazon.com, Inc.	`0.46ms` from Auckland, NZ
98.217.145.165	AS7922 Comcast Cable Communications, LLC	`9.33ms` from Boston, US
104.169.194.53	AS5650 Frontier Communications of America, Inc.	`10.61ms` from Chicago, US
75.211.220.149	AS6167 Verizon Business	`14.79ms` from Chicago, US
69.59.43.229	AS15335 KAPLAN TELEPHONE COMPANY, INC.	`14.21ms` from Dallas, US
217.82.179.117	AS3320 Deutsche Telekom AG	`3.73ms` from Duesseldorf, DE
68.49.14.229	AS7922 Comcast Cable Communications, LLC	`9.40ms` from Flint, US
139.6.37.53	AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V.	`18.62ms` from Frankfurt am Main, DE
223.4.56.117	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`7.16ms` from Hangzhou, CN

Traceroute

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

traceroute -a -n -q1 -f2 -m6 81.90.171.154

traceroute to 81.90.171.154 (81.90.171.154): 6 hops max, 52 byte packets

2 [] 193.27.15.94 3.2 ms

3 [AS174] 154.18.19.241 4.849 ms

4 *

5 *

6 *

Measurement taken from

IPinfo ProbeNet in Singapore, SG

On February 7th 2026

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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