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Autonomous System

AS1221

Telstra Limited

Telstra Limited Australia 🌐 telstra.com.au
Announced IPs
13,387,262
CIDR prefixes
281
ASN
AS1221

Reputation · trust score

A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.

58/100
Caution
How this score is built
  • Baseline (neutral) 65
  • Active-threat / abuse risk −12
  • Isp allocation +5
  • Trust score 58 / 100

Experimental · trust-vectors model v1.3.0 — a transparent heuristic, not a definitive verdict. How it works →

About Telstra

Telstra Group Limited is an Australian telecommunications company that builds and operates telecommunications networks and markets related products and services. It is a member of the S&P/ASX 20 stock index, and is Australia's largest telecommunications company by market share.

Founded
1975
Headquarters
Melbourne
Industry
telecommunications industry
Employees
31,931
Official website ↗ Summary from Wikipedia, CC BY-SA 4.0 · Data from Wikidata

⚠ 4 MOAS prefixes — multiple origin ASNs detected

All MOAS anomalies →

A previously stable prefix originated by AS1221 is now also announced by another ASN (MOAS — Multiple-Origin AS), detected from our RIPE RIS collectors. Often benign (anycast, multi-homing, or a recent transfer) — but it can signal a route leak or prefix hijack, so it's worth inspecting.

PrefixOrigin ASNsLast detected (UTC)
203.6.171.0/24 AS1221, AS18431 2026-11-12 14:24:01
159.222.184.0/24 AS1221, AS38882 2026-11-12 14:24:01
160.187.61.0/24 AS1221, AS136734 2026-11-12 14:24:01
148.80.1.0/24 AS1221, AS4826 2026-11-12 14:24:01

Network profile

Source: PeeringDB →
Geographic scope Australia
Traffic ratio Not Disclosed
Peering policy Selective
IRR record APNIC::AS1221:AS-TELSTRA
Website ↗ Looking glass ↗

Web3 footprint

AS1221 hosts 25 observed decentralized-network nodes across 3 networks. It’s a neutral signal — it does not affect the reputation score. See the full web3 node map.

Ξ Ethereum 15 GNO Gnosis 9 ₿ Bitcoin 1

AS1221 — global IP footprint

Cities where AS1221 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.

View on 3D globe →

Top CIDR ranges

CIDRIPsPTR DensityOrganizationCountryStateCity
1.144.0.0/12 1.05M
18.4%
Telstra Limited AU Western Australia Perth
58.160.0.0/12 1.05M
69.0%
Telstra Limited AU Western Australia Perth
101.176.0.0/12 1.05M
87.5%
Telstra Limited AU Western Australia Perth
121.208.0.0/12 1.05M
87.7%
Telstra Limited AU New South Wales Sydney
124.176.0.0/12 1.05M
84.9%
Telstra Limited AU Queensland Mount Mee
1.120.0.0/13 524.3K
49.2%
Telstra Limited AU Western Australia Perth
1.128.0.0/13 524.3K
0.0%
Telstra Limited AU New South Wales Sydney
1.136.0.0/13 524.3K
0.0%
Telstra Limited AU South Australia Adelaide
60.224.0.0/13 524.3K
74.5%
Telstra Limited AU New South Wales Sydney
101.168.0.0/13 524.3K
36.0%
Telstra Limited AU Northern Territory Darwin
101.184.0.0/13 524.3K
88.8%
Telstra Limited AU Western Australia Perth
110.144.0.0/13 524.3K
83.6%
Telstra Limited AU New South Wales Sydney
120.144.0.0/13 524.3K
79.9%
Telstra Limited AU Western Australia Perth
203.40.0.0/13 524.3K
20.5%
Telstra Limited AU Victoria Melbourne
1.132.0.0/14 262.1K
0.0%
Telstra Limited AU Queensland Brisbane
1.136.0.0/14 262.1K
0.0%
Telstra Limited AU Victoria Melbourne
101.160.0.0/14 262.1K
85.4%
Telstra Limited AU Queensland Sunshine Coast
101.176.0.0/14 262.1K
75.7%
Telstra Limited AU New South Wales Sydney
110.140.0.0/14 262.1K
49.4%
Telstra Limited AU New South Wales Wagga Wagga
120.152.0.0/14 262.1K
84.7%
Telstra Limited AU Queensland Brisbane
144.132.0.0/14 262.1K
56.1%
Telstra Limited AU Victoria Melbourne
203.36.0.0/14 262.1K
5.8%
Telstra Limited AU Victoria Melbourne
203.48.0.0/14 262.1K
30.8%
Telstra Limited AU Australian Capital Territory Canberra
1.128.0.0/15 131.1K
0.0%
Telstra Limited AU New South Wales Sydney
1.142.0.0/15 131.1K
0.0%
Telstra Limited AU South Australia Adelaide
101.164.0.0/15 131.1K
96.9%
Telstra Limited AU Victoria Melbourne
101.180.0.0/15 131.1K
97.8%
Telstra Limited AU Victoria Melbourne
120.156.0.0/15 131.1K
49.3%
Telstra Limited AU Victoria Melbourne
123.210.0.0/15 131.1K
49.9%
Telstra Limited AU New South Wales Sydney
144.136.0.0/15 131.1K
86.3%
Telstra Limited AU New South Wales Sydney
203.52.0.0/15 131.1K
5.8%
Telstra Limited AU Victoria Melbourne
1.131.0.0/16 65.5K
0.0%
Telstra Limited AU — —
1.141.0.0/16 65.5K
0.0%
Telstra Limited AU New South Wales Cobbitty
101.103.0.0/16 65.5K
97.2%
Telstra Limited AU New South Wales Sydney
101.166.0.0/16 65.5K
73.3%
Telstra Limited AU South Australia Adelaide
101.182.0.0/16 65.5K
95.4%
Telstra Limited AU Victoria Melbourne
120.158.0.0/16 65.5K
73.9%
Telstra Limited AU Victoria Melbourne
123.209.0.0/16 65.5K
0.0%
Telstra Limited AU Victoria Melbourne
125.255.0.0/16 65.5K
0.0%
Telstra Limited AU Victoria Sunbury
137.147.0.0/16 65.5K
98.5%
Telstra Limited AU Victoria Melbourne
138.130.0.0/16 65.5K
89.2%
Telstra Limited AU New South Wales Sydney
138.217.0.0/16 65.5K
39.6%
Telstra Limited AU South Australia Murray Bridge
139.130.0.0/16 65.5K
37.9%
Telstra Limited AU Western Australia Perth
139.134.0.0/16 65.5K
0.0%
Telstra Limited AU — —
139.168.0.0/16 65.5K
81.5%
Telstra Limited AU Australian Capital Territory Canberra
143.238.0.0/16 65.5K
80.2%
Telstra Limited AU New South Wales Sydney
144.131.0.0/16 65.5K
74.1%
Telstra Limited AU Victoria Melbourne
144.139.0.0/16 65.5K
20.6%
Telstra Limited AU Queensland Brisbane
144.140.0.0/16 65.5K
1.3%
Telstra Limited AU Victoria Melbourne
147.69.0.0/16 65.5K
98.7%
Telstra Limited AU Western Australia Perth
149.135.0.0/16 65.5K
12.1%
Telstra Limited AU Queensland Brisbane
165.228.0.0/16 65.5K
30.5%
Telstra Limited AU Victoria Melbourne
203.35.0.0/16 65.5K
3.2%
Telstra Limited AU Queensland Mackay
203.54.0.0/16 65.5K
23.1%
Telstra Limited AU Victoria Melbourne
1.130.0.0/17 32.8K
0.0%
Telstra Limited AU Victoria Melbourne
1.140.128.0/17 32.8K
0.0%
Telstra Limited AU South Australia Adelaide
61.9.128.0/17 32.8K
82.3%
Telstra Limited AU Victoria Melbourne
101.167.0.0/17 32.8K
96.8%
Telstra Limited AU Queensland Townsville
101.183.128.0/17 32.8K
96.0%
Telstra Limited AU Queensland Brisbane
144.130.0.0/17 32.8K
14.6%
Telstra Limited AU Queensland Brisbane
203.58.128.0/17 32.8K
1.0%
Telstra Limited AU Queensland Brisbane
1.130.128.0/18 16.4K
0.0%
Telstra Limited AU — —
1.140.0.0/18 16.4K
0.0%
Telstra Limited AU Victoria Melbourne
101.183.0.0/18 16.4K
96.9%
Telstra Limited AU New South Wales Sydney
144.130.192.0/18 16.4K
0.3%
Telstra Limited AU — —
202.12.128.0/18 16.4K
0.8%
Telstra Limited AU — —
203.27.128.0/18 16.4K
41.7%
Telstra Limited AU Queensland Brisbane
203.58.64.0/18 16.4K
1.4%
Telstra Limited AU New South Wales Sydney
203.143.192.0/18 16.4K
0.0%
Telstra Limited AU — —
1.130.192.0/19 8.2K
0.0%
Telstra Limited AU — —
1.140.64.0/19 8.2K
0.0%
Telstra Limited AU Victoria Melbourne
61.8.0.0/19 8.2K
23.2%
Telstra Limited AU Victoria Melbourne
101.167.128.0/19 8.2K
0.3%
Telstra Limited AU Victoria Melbourne
101.167.224.0/19 8.2K
0.7%
Telstra Limited AU Australian Capital Territory Canberra
101.183.96.0/19 8.2K
96.9%
Telstra Limited AU New South Wales Sydney
144.130.160.0/19 8.2K
23.0%
Telstra Limited AU Victoria Melbourne
192.74.160.0/19 8.2K
0.0%
Telstra Limited AU — —
192.148.128.0/19 8.2K
1.0%
Telstra Limited AU — —
202.7.64.0/19 8.2K
0.0%
Telstra Limited AU — —
202.12.192.0/19 8.2K
0.0%
Telstra Limited AU — —
203.58.32.0/19 8.2K
12.3%
Telstra Limited AU New South Wales Sydney
203.100.224.0/19 8.2K
0.0%
Telstra Limited AU — —
210.23.128.0/19 8.2K
25.1%
Telstra Limited AU Victoria Melbourne
1.130.224.0/20 4.1K
0.0%
Telstra Limited AU — —
1.140.96.0/20 4.1K
0.0%
Telstra Limited AU New South Wales Sydney
101.167.160.0/20 4.1K
47.5%
Telstra Limited AU New South Wales Sydney
101.183.64.0/20 4.1K
96.4%
Telstra Limited AU New South Wales Sydney
144.130.144.0/20 4.1K
0.0%
Telstra Limited AU New South Wales Bringelly
192.74.144.0/20 4.1K
0.0%
Telstra Limited AU — —
192.74.192.0/20 4.1K
0.0%
Telstra Limited AU — —
202.1.240.0/20 4.1K
0.1%
Telstra Limited PG — —
202.12.224.0/20 4.1K
0.5%
Telstra Limited AU — —
203.14.0.0/20 4.1K
15.0%
Telstra Limited AU — —
203.18.112.0/20 4.1K
36.5%
Telstra Limited AU — —
203.29.160.0/20 4.1K
0.0%
Telstra Limited AU — —
1.130.240.0/21 2.0K
0.0%
Telstra Limited AU — —
1.140.120.0/21 2.0K
0.0%
Telstra Limited AU New South Wales Sydney
101.183.88.0/21 2.0K
97.2%
Telstra Limited AU New South Wales Sydney
192.148.120.0/21 2.0K
7.0%
Telstra Limited AU — —
203.12.144.0/21 2.0K
0.0%
Telstra Limited AU — —

BGP Announced Prefixes

Live BGP anomalies →

Prefixes AS1221 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.

PrefixAnnouncement samplesLast seen
149.176.223.0/24 96,172 2026-11-12 13:58:56
203.20.87.0/24 46,121 2026-11-12 14:15:42
203.4.131.0/24 37,019 2026-11-12 14:15:42
203.12.62.0/24 36,927 2026-11-12 14:15:42
203.22.150.0/24 36,897 2026-11-12 14:15:42
203.30.92.0/23 36,518 2026-11-12 14:15:42
203.4.196.0/24 35,815 2026-11-12 14:15:42
203.30.94.0/23 35,133 2026-11-12 14:15:42
1.120.0.0/13 33,617 2026-11-12 14:15:42
192.74.139.0/24 33,482 2026-11-12 14:15:42
203.23.86.0/24 33,444 2026-11-12 14:15:42
1.128.0.0/11 32,652 2026-11-12 14:15:42
149.176.116.0/24 32,436 2026-11-12 13:58:56
203.13.76.0/24 32,282 2026-11-12 13:58:56
203.13.77.0/24 32,206 2026-11-12 13:58:56
203.3.100.0/24 32,090 2026-11-12 14:15:42
202.1.240.0/20 32,043 2026-11-12 14:15:42
203.18.35.0/24 31,952 2026-11-12 14:15:42
203.16.140.0/24 31,786 2026-11-12 14:15:42
203.22.147.0/24 31,481 2026-11-12 14:15:42
202.36.14.0/24 31,416 2026-11-12 14:15:42
203.32.17.0/24 31,103 2026-11-12 14:15:42
164.108.24.0/22 31,020 2026-11-12 14:21:30
202.8.92.0/24 30,966 2026-11-12 14:15:42
202.70.143.0/24 30,465 2026-11-12 14:15:42
202.3.74.0/24 29,961 2026-11-12 14:15:42
149.176.221.0/24 29,931 2026-11-12 13:58:56
164.108.17.0/24 29,739 2026-11-12 14:21:30
203.4.192.0/24 29,674 2026-11-12 14:15:42
164.108.181.0/24 29,642 2026-11-12 14:21:30
203.4.193.0/24 29,639 2026-11-12 14:15:42
164.108.10.0/24 29,624 2026-11-12 14:21:30
164.108.9.0/24 29,604 2026-11-12 14:21:30
203.22.83.0/24 29,588 2026-11-12 14:15:42
203.34.229.0/24 29,354 2026-11-12 13:58:56
203.34.228.0/24 29,308 2026-11-12 13:58:56
203.58.128.0/17 29,277 2026-11-12 14:15:42
203.48.0.0/14 29,198 2026-11-12 14:15:42
203.30.92.0/22 29,177 2026-11-12 14:15:42
203.3.101.0/24 29,173 2026-11-12 14:15:42
203.3.102.0/24 29,169 2026-11-12 14:15:42
203.26.245.0/24 29,123 2026-11-12 14:15:42
203.12.83.0/24 29,099 2026-11-12 13:58:56
203.40.0.0/13 29,059 2026-11-12 14:15:42
103.136.214.0/24 29,015 2026-11-12 14:15:42
203.18.112.0/20 28,992 2026-11-12 14:15:42
203.4.130.0/24 28,987 2026-11-12 14:15:42
203.62.248.0/21 28,910 2026-11-12 14:15:42
203.143.192.0/18 28,906 2026-11-12 14:15:42
203.62.148.0/22 28,902 2026-11-12 14:15:42

Showing top 50 of 293 announced prefixes by sample volume.

Frequently Asked Questions

What is AS1221?

AS1221 is an Autonomous System Number assigned to Telstra Limited. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).

How many IP addresses does AS1221 announce?

AS1221 announces 13.39M IPv4 addresses distributed across 281 routed CIDR prefixes. The network is registered in Australia.

Who operates AS1221?

AS1221 is operated by Telstra Limited. The organization is based in Australia. You can view all IP ranges and related ASNs on the organization page.

What country is AS1221 registered in?

AS1221 is registered in Australia. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.

Last updated: 2026-11-12 14:24:06 UTC
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