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Autonomous System

AS1221

Telstra Limited

Organization
ASN-TELSTRA - Telstra Limited
ASN
AS1221
Country
Australia
Category
ISP
Announced IPv4 prefixes
283
Announced IPv6 prefixes
2
Registry
APNIC

By: Katia Belokon · Verified July 2026

IP Geolocation LookupWHOIS LookupVPN Leak Test

What is AS1221?

AS1221 is the autonomous system operated by Telstra Limited, registered with APNIC. It currently announces 283 IPv4 prefixes and 2 IPv6 prefixes to the global routing table. Addresses in this network belong to residential and mobile subscribers, so seeing AS1221 in a lookup means the connection is a consumer line rather than a data center.

Check IPs in AS1221 with MyIPScan tools

IP Geolocation LookupResolve any address to its ASN and location.WHOIS LookupRegistered CIDR block for any address.VPN Leak TestCheck whether your VPN hides your real IP.Telstra Limited IP rangesAnnounced prefixes for this network.DNS Leak TestSee which resolver answers your queries.What Is an ASN?How autonomous systems identify networks.

Frequently asked questions about AS1221

What is AS1221?

AS1221 is the autonomous system operated by Telstra Limited, registered with APNIC. It currently announces 283 IPv4 prefixes and 2 IPv6 prefixes to the global routing table. Addresses in this network belong to residential and mobile subscribers, so seeing AS1221 in a lookup means the connection is a consumer line rather than a data center.

Who owns AS1221?

AS1221 is held by Telstra Limited according to APNIC registry records. The registered holder name is ASN-TELSTRA - Telstra Limited.

Why does AS1221 appear in my VPN test?

If AS1221 shows as your visible ASN while a VPN is connected, the tunnel is not carrying your traffic and your real Telstra Limited connection is exposed to websites.

How large is the AS1221 network?

By CAIDA's AS Rank, AS1221 reaches 837 networks through its customer cone, covering roughly 255.7 million IPv4 addresses, placing it at global rank 75 among all autonomous systems.

How do I investigate IPs in AS1221?

Use the MyIPScan IP Geolocation Lookup to resolve any address to its ASN and location, and WHOIS Lookup for the registered CIDR block. Addresses in this network return AS1221 (ASN-TELSTRA - Telstra Limited).