AS1221 Telstra Limited

ASN-TELSTRA - Telstra Limited · registered in Australia

IPv4 addresses13,386,240239 prefixes · 0.427% of announced IPv4

Rank in Australia#1largest network in AU by IPv4 space, of 1,660 · 34.36% of AU

Rank worldwide#31of 79,396 networks with IPv4

IPv64,096 x /32 (268,435,457 x /48)2 prefixes

CountryAustralia1,688 ASNs registered there

Open AS1221 in ASN lookup Look up an IP in this network (1.120.0.1) All networks in Australia

IPv4 prefixes

All 239 prefixes, in address order.

1.120.0.0/13
1.128.0.0/11
58.160.0.0/12
60.224.0.0/13
61.8.0.0/19
61.9.128.0/17
66.111.164.0/24
66.111.166.0/24
66.111.168.0/24
66.111.171.0/24
66.111.173.0/24
101.103.0.0/16
101.160.0.0/14
101.164.0.0/15
101.166.0.0/16
101.167.0.0/17
101.167.128.0/19
101.167.160.0/20
101.167.224.0/19
101.168.0.0/13
101.176.0.0/12
103.58.34.0/23
103.58.212.0/24
103.78.241.0/24
103.136.214.0/24
103.149.43.0/24
103.195.64.0/24
103.226.244.0/23
103.247.118.0/23
110.140.0.0/14
110.144.0.0/13
120.144.0.0/13
120.152.0.0/14
120.156.0.0/15
120.158.0.0/16
121.208.0.0/12
122.200.24.0/23
123.209.0.0/16
123.210.0.0/15
124.176.0.0/12
125.255.0.0/16
136.238.200.0/24
137.147.0.0/16
138.130.0.0/16
138.217.0.0/16
139.130.0.0/16
139.134.0.0/16
139.168.0.0/16
143.223.18.0/24
143.223.87.0/24
143.238.0.0/16
144.130.0.0/17
144.130.144.0/20
144.130.160.0/19
144.130.192.0/18
144.131.0.0/16
144.132.0.0/14
144.136.0.0/15
144.139.0.0/16
144.140.0.0/16
146.144.9.0/24
147.69.0.0/16
149.135.0.0/16
149.176.112.0/24
149.176.116.0/24
149.176.172.0/24
149.176.221.0/24
149.176.223.0/24
149.176.225.0/24
149.176.226.0/23
149.176.244.0/24
149.176.246.0/24
149.176.248.0/24
149.176.250.0/23
149.176.252.0/22
156.22.1.0/24
156.22.2.0/24
158.45.0.0/22
158.45.13.0/24
158.45.14.0/24
158.45.60.0/22
158.45.100.0/24
158.45.104.0/24
158.45.112.0/24
158.45.116.0/24
158.45.120.0/24
158.146.145.0/24
158.146.152.0/24
160.187.61.0/24
164.108.9.0/24
164.108.10.0/24
164.108.17.0/24
164.108.24.0/22
164.108.105.0/24
164.108.181.0/24
165.228.0.0/16
168.233.31.0/24
180.94.27.0/24
192.74.139.0/24
192.74.140.0/22
192.74.144.0/20
192.74.160.0/19
192.74.192.0/20
192.74.208.0/24
192.111.105.0/24
192.131.150.0/24
192.148.116.0/22
192.148.120.0/21
192.148.128.0/19
192.148.160.0/22
192.148.164.0/23
192.158.45.0/24
192.195.197.0/24
192.243.20.0/22
198.57.15.0/24
202.1.240.0/20
202.3.74.0/24
202.4.181.0/24
202.7.64.0/19
202.8.92.0/24
202.12.128.0/18
202.12.192.0/19
202.12.224.0/20
202.12.240.0/23
202.12.242.0/24
202.36.14.0/24
202.58.226.0/24
202.70.143.0/24
202.93.155.0/24
203.2.228.0/24
203.3.100.0/23
203.3.102.0/24
203.4.130.0/23
203.4.192.0/23
203.4.196.0/24
203.5.58.0/24
203.5.88.0/24
203.5.176.0/23
203.6.127.0/24
203.6.171.0/24
203.8.90.0/24
203.9.190.0/23
203.11.4.0/24
203.12.62.0/24
203.12.83.0/24
203.12.132.0/24
203.12.144.0/21
203.12.231.0/24
203.13.76.0/23
203.14.0.0/20
203.14.116.0/23
203.14.160.0/23
203.14.222.0/23
203.15.68.0/24
203.15.254.0/24
203.16.140.0/24
203.16.180.0/22
203.17.40.0/21
203.17.162.0/24
203.18.34.0/23
203.18.112.0/20
203.20.43.0/24
203.20.87.0/24
203.20.197.0/24
203.20.199.0/24
203.20.238.0/23
203.21.49.0/24
203.21.50.0/23
203.21.52.0/22
203.21.56.0/22
203.21.63.0/24
203.21.192.0/21
203.22.83.0/24
203.22.134.0/24
203.22.147.0/24
203.22.150.0/24
203.23.20.0/23
203.23.41.0/24
203.23.75.0/24
203.23.86.0/24
203.24.32.0/23
203.24.126.0/24
203.24.134.0/23
203.24.170.0/24
203.24.194.0/24
203.25.142.0/24
203.25.248.0/24
203.25.253.0/24
203.26.8.0/22
203.26.175.0/24
203.26.245.0/24
203.27.56.0/24
203.27.69.0/24
203.27.72.0/24
203.27.128.0/18
203.27.193.0/24
203.27.225.0/24
203.28.234.0/24
203.29.94.0/24
203.29.160.0/20
203.30.64.0/24
203.30.92.0/22
203.30.201.0/24
203.31.62.0/23
203.32.16.0/22
203.33.151.0/24
203.33.251.0/24
203.34.41.0/24
203.34.68.0/24
203.34.78.0/23
203.34.131.0/24
203.34.223.0/24
203.34.228.0/23
203.35.0.0/16
203.36.0.0/14
203.40.0.0/13
203.48.0.0/14
203.52.0.0/15
203.54.0.0/16
203.55.15.0/24
203.55.98.0/24
203.55.180.0/24
203.55.186.0/24
203.56.94.0/24
203.57.219.0/24
203.58.32.0/19
203.58.64.0/18
203.58.128.0/17
203.62.148.0/22
203.62.202.0/24
203.62.205.0/24
203.62.248.0/21
203.92.248.0/24
203.92.252.0/24
203.100.224.0/19
203.143.192.0/18
203.148.93.0/24
206.225.235.0/24
210.23.128.0/19

IPv6 prefixes

All 2 prefixes.

2001:8000::/20
2401:a480::/48

Other ASNs named Telstra Limited

2 other networks use the same organisation name; together with AS1221 they announce 13,460,480 IPv4 addresses.

ASNNameIPv4 addresses

AS132029ASN-TELSTRA-02 - Telstra Limited AU73,984

AS133859TELSTRA-AS-AP - Telstra Limited AU256

Similar-sized networks in Australia

ASNNameIPv4 addresses

AS4804#2 MPX-AS - Microplex PTY LTD5,270,784

AS7545#3 TPG-INTERNET-AP - TPG Telecom Limited3,103,744

AS9443#4 VOCUS-RETAIL-AU - Vocus Retail1,143,808

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources