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Autonomous System

AS1221

Telstra Limited

Telstra Limited Australia 🌐 telstra.com.au
Announced IPs
13,389,056
CIDR prefixes
328
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 v1.2.0 — 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

⚠ 3 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)
159.222.184.0/24 AS1221, AS38882 2026-09-08 11:25:22
148.80.1.0/24 AS1221, AS4826 2026-09-08 11:25:22
160.187.61.0/24 AS1221, AS136734 2026-09-08 11:10:22

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 1 observed decentralized-network node across 1 network. It’s a neutral signal — it does not affect the reputation score. See the full web3 node map.

IPFS IPFS 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
1.128.0.0/11 2.10M
8.8%
Telstra Limited AU Western Australia Perth
1.128.0.0/12 1.05M
0.0%
Telstra Limited AU New South Wales Sydney
58.160.0.0/12 1.05M
67.8%
Telstra Limited AU Western Australia Perth
101.176.0.0/12 1.05M
85.4%
Telstra Limited AU Western Australia Perth
121.208.0.0/12 1.05M
85.9%
Telstra Limited AU New South Wales Sydney
124.176.0.0/12 1.05M
84.7%
Telstra Limited AU Queensland Mount Mee
1.120.0.0/13 524.3K
46.5%
Telstra Limited AU South Australia Adelaide
1.128.0.0/13 524.3K
0.0%
Telstra Limited AU Victoria Melbourne
1.144.0.0/13 524.3K
0.0%
Telstra Limited AU Queensland Brisbane
60.224.0.0/13 524.3K
72.5%
Telstra Limited AU Queensland Townsville
101.168.0.0/13 524.3K
35.7%
Telstra Limited AU Western Australia Perth
101.176.0.0/13 524.3K
0.0%
Telstra Limited AU Queensland Townsville
110.144.0.0/13 524.3K
82.6%
Telstra Limited AU Victoria Melbourne
120.144.0.0/13 524.3K
80.0%
Telstra Limited AU Western Australia Perth
203.40.0.0/13 524.3K
19.4%
Telstra Limited AU New South Wales Sydney
1.136.0.0/14 262.1K
0.0%
Telstra Limited AU Victoria Melbourne
1.152.0.0/14 262.1K
0.0%
Telstra Limited AU Victoria Melbourne
101.160.0.0/14 262.1K
85.0%
Telstra Limited AU Queensland Sunshine Coast
101.176.0.0/14 262.1K
0.0%
Telstra Limited AU Queensland Townsville
101.184.0.0/14 262.1K
0.0%
Telstra Limited AU New South Wales Sydney
110.140.0.0/14 262.1K
49.0%
Telstra Limited AU Victoria Melbourne
120.152.0.0/14 262.1K
84.7%
Telstra Limited AU Queensland Brisbane
144.132.0.0/14 262.1K
54.6%
Telstra Limited AU Victoria Melbourne
203.36.0.0/14 262.1K
5.4%
Telstra Limited AU Victoria Melbourne
203.48.0.0/14 262.1K
29.2%
Telstra Limited AU Queensland Brisbane
1.142.0.0/15 131.1K
0.0%
Telstra Limited AU South Australia Adelaide
1.156.0.0/15 131.1K
47.9%
Telstra Limited AU Queensland Brisbane
101.164.0.0/15 131.1K
95.9%
Telstra Limited AU Queensland Brisbane
101.180.0.0/15 131.1K
0.0%
Telstra Limited AU Victoria Melbourne
101.190.0.0/15 131.1K
0.0%
Telstra Limited AU New South Wales Sydney
120.156.0.0/15 131.1K
49.3%
Telstra Limited AU Victoria Melbourne
123.210.0.0/15 131.1K
49.3%
Telstra Limited AU New South Wales Sydney
144.136.0.0/15 131.1K
84.1%
Telstra Limited AU New South Wales Sydney
203.52.0.0/15 131.1K
5.5%
Telstra Limited AU New South Wales Byron Bay
1.141.0.0/16 65.5K
0.0%
Telstra Limited AU New South Wales Sydney
1.158.0.0/16 65.5K
94.4%
Telstra Limited AU New South Wales Sydney
101.103.0.0/16 65.5K
95.7%
Telstra Limited AU New South Wales Sydney
101.166.0.0/16 65.5K
72.9%
Telstra Limited AU New South Wales Sydney
101.182.0.0/16 65.5K
0.0%
Telstra Limited AU Victoria Melbourne
101.189.0.0/16 65.5K
0.0%
Telstra Limited AU Western Australia Perth
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 Melbourne
137.147.0.0/16 65.5K
98.4%
Telstra Limited AU Victoria Melbourne
138.130.0.0/16 65.5K
89.0%
Telstra Limited AU New South Wales Sydney
138.217.0.0/16 65.5K
37.0%
Telstra Limited AU Victoria Melbourne
139.130.0.0/16 65.5K
38.4%
Telstra Limited AU Queensland Brisbane
139.134.0.0/16 65.5K
0.0%
Telstra Limited AU — —
139.168.0.0/16 65.5K
77.1%
Telstra Limited AU Australian Capital Territory Canberra
143.238.0.0/16 65.5K
80.1%
Telstra Limited AU New South Wales Sydney
144.131.0.0/16 65.5K
73.8%
Telstra Limited AU Victoria Melbourne
144.139.0.0/16 65.5K
20.4%
Telstra Limited AU Victoria Melbourne
144.140.0.0/16 65.5K
1.3%
Telstra Limited AU Victoria Melbourne
147.69.0.0/16 65.5K
98.4%
Telstra Limited AU Western Australia Perth
149.135.0.0/16 65.5K
12.2%
Telstra Limited AU Queensland Brisbane
165.228.0.0/16 65.5K
28.1%
Telstra Limited AU South Australia Adelaide
203.35.0.0/16 65.5K
3.0%
Telstra Limited AU Victoria Melbourne
203.54.0.0/16 65.5K
21.8%
Telstra Limited AU Victoria Melbourne
1.140.128.0/17 32.8K
0.0%
Telstra Limited AU South Australia Adelaide
1.159.128.0/17 32.8K
91.9%
Telstra Limited AU Western Australia Perth
61.9.128.0/17 32.8K
82.4%
Telstra Limited AU Victoria Melbourne
101.167.0.0/17 32.8K
95.6%
Telstra Limited AU Queensland Townsville
101.183.128.0/17 32.8K
0.0%
Telstra Limited AU Queensland Brisbane
101.188.128.0/17 32.8K
0.0%
Telstra Limited AU Queensland Brisbane
144.130.0.0/17 32.8K
14.5%
Telstra Limited AU Queensland Brisbane
203.58.128.0/17 32.8K
0.9%
Telstra Limited AU Queensland Brisbane
1.140.0.0/18 16.4K
0.0%
Telstra Limited AU Victoria Melbourne
1.159.64.0/18 16.4K
93.9%
Telstra Limited AU Victoria Melbourne
101.183.0.0/18 16.4K
0.0%
Telstra Limited AU New South Wales Sydney
101.188.64.0/18 16.4K
0.0%
Telstra Limited AU Victoria Melbourne
144.130.192.0/18 16.4K
0.6%
Telstra Limited AU — —
202.12.128.0/18 16.4K
0.7%
Telstra Limited AU — —
203.27.128.0/18 16.4K
37.7%
Telstra Limited AU Victoria Melbourne
203.58.64.0/18 16.4K
1.3%
Telstra Limited AU Victoria Melbourne
203.143.192.0/18 16.4K
0.0%
Telstra Limited AU — —
1.140.64.0/19 8.2K
0.0%
Telstra Limited AU Victoria Melbourne
1.159.32.0/19 8.2K
93.4%
Telstra Limited AU Victoria Melbourne
61.8.0.0/19 8.2K
23.1%
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
0.0%
Telstra Limited AU New South Wales Sydney
101.188.32.0/19 8.2K
0.0%
Telstra Limited AU Victoria Melbourne
144.130.160.0/19 8.2K
23.3%
Telstra Limited AU Victoria Melbourne
192.74.160.0/19 8.2K
0.0%
Telstra Limited AU — —
192.148.128.0/19 8.2K
0.9%
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
11.9%
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
25.2%
Telstra Limited AU New South Wales Sydney
1.140.96.0/20 4.1K
0.0%
Telstra Limited AU New South Wales Sydney
1.159.0.0/20 4.1K
91.6%
Telstra Limited AU Victoria Melbourne
101.167.160.0/20 4.1K
46.3%
Telstra Limited AU Victoria Melbourne
101.183.64.0/20 4.1K
0.0%
Telstra Limited AU New South Wales Sydney
101.188.16.0/20 4.1K
0.0%
Telstra Limited AU Victoria Melbourne
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
0.4%
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 85,339 2026-09-08 11:16:45
203.12.62.0/24 27,692 2026-09-08 11:17:15
203.22.150.0/24 27,378 2026-09-08 11:17:15
203.30.92.0/23 26,795 2026-09-08 11:17:15
149.176.116.0/24 25,651 2026-09-08 11:16:45
203.30.94.0/23 25,299 2026-09-08 11:17:15
203.23.86.0/24 24,216 2026-09-08 11:17:15
203.20.87.0/24 23,989 2026-09-08 11:17:15
1.120.0.0/13 23,852 2026-09-08 11:16:45
1.128.0.0/11 23,213 2026-09-08 11:16:45
149.176.221.0/24 23,135 2026-09-08 11:16:45
203.4.196.0/24 22,924 2026-09-08 11:17:15
203.22.147.0/24 22,253 2026-09-08 11:17:15
164.108.24.0/22 22,150 2026-09-08 11:16:45
202.8.92.0/24 20,956 2026-09-08 11:17:15
192.74.139.0/24 20,939 2026-09-08 11:16:45
202.3.74.0/24 20,797 2026-09-08 11:17:15
202.1.240.0/20 20,032 2026-09-08 11:17:15
149.176.254.0/24 19,611 2026-09-08 11:16:45
203.3.100.0/24 19,544 2026-09-08 11:17:15
203.4.192.0/24 19,482 2026-09-08 11:17:15
203.22.83.0/24 19,481 2026-09-08 11:17:15
203.4.193.0/24 19,464 2026-09-08 11:17:15
149.176.248.0/24 19,370 2026-09-08 11:16:45
203.3.101.0/24 19,343 2026-09-08 11:17:15
203.3.102.0/24 19,341 2026-09-08 11:17:15
203.16.140.0/24 19,326 2026-09-08 11:17:15
203.26.245.0/24 19,322 2026-09-08 11:17:15
203.30.92.0/22 19,320 2026-09-08 11:17:15
203.32.17.0/24 19,237 2026-09-08 11:17:15
203.58.128.0/17 19,229 2026-09-08 11:17:15
203.40.0.0/13 19,209 2026-09-08 11:17:15
203.18.112.0/20 19,158 2026-09-08 11:17:15
203.4.130.0/24 19,152 2026-09-08 11:17:15
203.4.131.0/24 19,148 2026-09-08 11:17:15
203.32.16.0/24 19,133 2026-09-08 11:17:15
203.48.0.0/14 19,102 2026-09-08 11:17:15
203.6.127.0/24 19,099 2026-09-08 11:17:15
203.143.192.0/18 19,087 2026-09-08 11:17:15
203.62.248.0/21 19,082 2026-09-08 11:17:15
203.100.224.0/19 19,078 2026-09-08 11:17:15
202.36.14.0/24 19,066 2026-09-08 11:17:15
203.92.252.0/24 19,065 2026-09-08 11:17:15
203.58.64.0/18 19,064 2026-09-08 11:17:15
203.92.248.0/24 19,058 2026-09-08 11:17:15
203.58.32.0/19 19,057 2026-09-08 11:17:15
203.62.148.0/22 19,050 2026-09-08 11:17:15
203.54.0.0/16 19,037 2026-09-08 11:17:15
203.35.0.0/16 19,026 2026-09-08 11:17:15
203.34.68.0/24 19,023 2026-09-08 11:17:15

Showing top 50 of 289 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 328 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: 2026-09-08 11:24:05 UTC
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