203.12.144.0/21

AS1221  ·  Telstra Limited

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Summary

Country Australia
Domain telstra.net
ASN AS1221
Registry APNIC
ID TELSTRAINTERNET-AU

WHOIS Details

inetnum:        203.12.144.0 - 203.12.151.255
netname:        TELSTRAINTERNET-AU
descr:          Telstra Limited
country:        AU
org:            ORG-TC6-AP
admin-c:        TIAR-AP
tech-c:         TAN2-AP
status:         ALLOCATED PORTABLE
abuse-c:        AT1005-AP
remarks:        -----
remarks:        All reports regarding SPAM or security breaches
remarks:        should be addressed to [email protected]
remarks:        ------
mnt-by:         APNIC-HM
mnt-lower:      MAINT-AU-TIAR-AP
mnt-routes:     MAINT-AU-TIAR-AP
mnt-irt:        IRT-TELSTRA-AU
last-modified:  2024-05-10T00:50:23Z
source:         APNIC

irt:            IRT-TELSTRA-AU
address:        Telstra Internet
e-mail:         [email protected]
abuse-mailbox:  [email protected]
admin-c:        TIAR-AP
tech-c:         TIAR-AP
auth:           # Filtered
remarks:        [email protected] was validated on 2026-01-26
mnt-by:         MAINT-AU-TIAR-AP
last-modified:  2026-01-26T01:19:20Z
source:         APNIC

organisation:   ORG-TC6-AP
org-name:       Telstra Limited
org-type:       LIR
country:        AU
address:        242 Exhibition Street
e-mail:         [email protected]
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2024-12-06T08:30:50Z
source:         APNIC

role:           ABUSE TELSTRAAU
country:        ZZ
address:        Telstra Internet
phone:          +000000000
e-mail:         [email protected]
admin-c:        TIAR-AP
tech-c:         TIAR-AP
nic-hdl:        AT1005-AP
remarks:        Generated from irt object IRT-TELSTRA-AU
remarks:        [email protected] was validated on 2026-01-26
abuse-mailbox:  [email protected]
mnt-by:         APNIC-ABUSE
last-modified:  2026-01-26T01:19:29Z
source:         APNIC

role:           Telstra AU NOC
address:        Telstra Internet
address:        242 Exhibition Street
address:        Melbourne
address:        VIC 3000
country:        AU
phone:          +61 3 8650 3305
e-mail:         [email protected]
admin-c:        TIAR-AP
tech-c:         TIAR-AP
nic-hdl:        TAN2-AP
mnt-by:         MAINT-AU-TIAR-AP
last-modified:  2025-11-26T05:11:17Z
source:         APNIC

person:         Telstra Internet Address Registry
address:        Telstra Internet
address:        242 Exhibition St
address:        Melbourne
address:        VIC 3000
country:        AU
phone:          +61 000000000
e-mail:         [email protected]
nic-hdl:        TIAR-AP
remarks:        Telstra Internet Address Registry Role Object
mnt-by:         MAINT-AU-TIAR-AP
last-modified:  2021-12-09T22:28:56Z
source:         APNIC

route:          203.12.144.0/21
origin:         AS1221
descr:          Telstra Corporation 242 Exhibition Street
mnt-by:         MAINT-AU-TIAR-AP
last-modified:  2021-01-22T04:38:23Z
source:         APNIC

route:          203.12.144.0/21
origin:         AS19905
descr:          Telstra Corporation Limited 242 Exhibition Street
mnt-by:         MAINT-AU-TIAR-AP
last-modified:  2022-09-12T02:07:49Z
source:         APNIC

Nearby Ranges

BGP prefixes that overlap with 203.12.0.0/16

Range ASN Company Num of IPs
203.12.176.0/20 AS703 Verizon Australia Pty Limited 4,096
203.12.104.0/21 AS58713 Melbourne PC User Group Inc 2,048
203.12.152.0/21 AS58713 Melbourne PC User Group Inc 2,048
203.12.160.0/21 AS7545 TPG Internet Pty Ltd. 2,048
203.12.236.0/22 AS151499 Australian Public Access Network Association 1,024
203.12.80.0/23 AS133612 VODAFONE AUSTRALIA PTY LIMITED 512
203.12.252.0/23 AS154106 VNG ONLINE COMPANY LIMITED 512
203.12.52.0/23 AS4739 iiNet Limited 512
203.12.40.0/23 AS6262 CSIRO Division of Mathematics and Statistics 512
203.12.254.0/23 AS154107 DigitalLink Global Network Limited 512
203.12.15.0/24 AS134697 Launtel 256
203.12.2.0/24 AS134697 Launtel 256
203.12.3.0/24 AS134697 Launtel 256
203.12.4.0/24 AS134697 Launtel 256
203.12.5.0/24 AS134697 Launtel 256
203.12.6.0/24 AS134697 Launtel 256
203.12.7.0/24 AS134697 Launtel 256
203.12.8.0/24 AS134697 Launtel 256
203.12.9.0/24 AS134697 Launtel 256
203.12.86.0/24 AS136408 LORETO MANDEVILLE HALL TOORAK LIMITED 256
203.12.229.0/24 AS137442 Cairns Airport Pty Ltd 256
203.12.230.0/24 AS137442 Cairns Airport Pty Ltd 256
203.12.18.0/24 AS138185 LUKBAN TELEPHONE SYSTEM, INC. 256
203.12.29.0/24 AS148968 Falcore Investments Pty Ltd 256
203.12.249.0/24 AS153035 CiFi Pty Ltd 256
203.12.218.0/24 AS16509 Intruder Systems Ltd 256
203.12.248.0/24 AS17463 EtherTech Pty Ltd 256
203.12.28.0/24 AS17763 Terrinell Pty. Ltd. 256
203.12.234.0/24 AS17766 Nexon Asia Pacific Pty Ltd 256
203.12.131.0/24 AS19625 Andrew John Howard 256
203.12.31.0/24 AS210083 Oma Gosh AB 256
203.12.115.0/24 AS2764 Whitehorse Manningham Regional Library Corporation 256
203.12.36.0/24 AS2764 St. Kevin's College Ltd 256
203.12.220.0/24 AS38044 GITN-NETWORK 256
203.12.235.0/24 AS38830 Levart Distribution Systems Pty Ltd 256
203.12.45.0/24 AS45657 NSW Rural Fire Service 256
203.12.221.0/24 AS45912 Indue 256
203.12.172.0/24 AS4768 Canon Australia Pty. Ltd. 256
203.12.173.0/24 AS4768 Canon Australia Pty. Ltd. 256
203.12.91.0/24 AS4809 CTHKI-CN-FuJian network 256
203.12.251.0/24 AS4826 VOCUS PTY LTD 256
203.12.97.0/24 AS4826 Telstra Limited 256
203.12.174.0/24 AS55914 Canon Australia Pty. Ltd. 256
203.12.175.0/24 AS55914 Canon Australia Pty. Ltd. 256
203.12.88.0/24 AS63527 Chinatelecom Global Network 256
203.12.89.0/24 AS63527 Chinatelecom Global Network 256
203.12.129.0/24 AS63956 5G NETWORK OPERATIONS PTY LTD 256
203.12.228.0/24 AS7545 Far North Queensland Ports Corporation Limited 256
203.12.170.0/24 AS7575 John Paul College 256

Hosted domains

There are no domains currently hosted on this ASN.

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

No IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

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
24.91.82.213 AS7922 Comcast Cable Communications, LLC 5.71ms from Boston, US
193.74.61.197 AS5432 Proximus NV 2.20ms from Brussels, BE
212.98.100.245 AS42525 GlobalConnect A/S 0.56ms from Copenhagen, DK
14.102.126.213 AS18002 AS Number for Interdomain Routing 1.06ms from Delhi, IN
93.195.29.133 AS3320 Deutsche Telekom AG 5.38ms from Frankfurt am Main, DE
87.168.196.149 AS3320 Deutsche Telekom AG 6.74ms from Frankfurt am Main, DE
157.157.141.5 AS6677 Mila hf 5.23ms from Hafnarfjoerdur, IS
129.173.154.149 AS8111 Dalhousie University 0.34ms from Halifax, CA
175.201.244.165 AS4766 Korea Telecom 5.00ms from Incheon, KR
109.224.162.85 AS8468 ENTANET International Limited 0.46ms from London, GB
78.127.47.213 AS15557 Societe Francaise Du Radiotelephone - SFR SA 10.16ms from Lyon, FR
23.227.138.197 AS55081 24 SHELLS 0.65ms from New York City, US
79.241.249.181 AS3320 Deutsche Telekom AG 6.23ms from Nuernberg, DE
97.68.202.53 AS33363 Charter Communications, Inc 2.43ms from Orlando, US
189.18.96.117 AS27699 TELEFÔNICA BRASIL S.A 1.84ms from Osasco, BR
77.37.69.37 AS47583 Hostinger International Limited 0.36ms from Osasco, BR
89.11.136.229 AS29695 Lyse Tele AS 3.29ms from Oslo, NO
27.198.184.101 AS4837 CHINA UNICOM China169 Backbone 8.08ms from Qingdao, CN
54.235.68.133 AS14618 Amazon.com, Inc. 0.21ms from Reston, US
135.26.156.133 AS14051 Fidium 5.64ms from San Jose, US
210.176.150.69 AS4637 Telstra Global 0.48ms from Seoul, KR
140.206.107.117 AS17621 China Unicom Shanghai network 2.33ms from Shanghai, CN
58.35.218.69 AS4812 China Telecom (Group) 4.73ms from Shanghai, CN
126.78.66.245 AS17676 SoftBank Corp. 2.88ms from Tokyo, JP
213.108.51.213 AS200316 DMT Software House Sp. z o.o. 4.87ms from Warsaw, PL

Traceroute

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

$
traceroute -a -n -q1 -m8 203.12.144.67
traceroute to 203.12.144.67 (203.12.144.67): 8 hops max, 52 byte packets
2 *
3 [AS1221] 203.50.11.198 3.475 ms
4 [AS1221] 203.50.13.124 3.836 ms
5 [AS1221] 203.50.13.132 14.849 ms
6 *
7 *
8 *
Measurement taken from IPinfo ProbeNet in Melbourne, AU
On

What are IP address ranges?

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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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