Telstra IP Ranges
Telstra is Australia's incumbent carrier, registered with APNIC as AS1221 under the AS name ASN-TELSTRA. The same ASN is both a retail access network and a large transit network, and its consumer addresses are still named under the retired bigpond.net.au brand.
- Provider
- Telstra
- Primary ASN
- AS1221
- Category
- ISP
- Headquarters
- Melbourne, Australia
- Announced IPv4 prefixes
- 283
- Registry
- APNIC
Known IP ranges
These prefixes are currently announced to the global routing table by AS1221 (ASN-TELSTRA - Telstra Limited). Prefix sets change over time - use WHOIS Lookup for the authoritative record on any specific address.
1.128.0.0/11
101.160.0.0/11
121.208.0.0/12
124.176.0.0/12
58.160.0.0/12
60.224.0.0/13
1.120.0.0/13
203.40.0.0/13
110.144.0.0/13
120.144.0.0/13
2001:8000::/20
2401:a480::/48 (IPv6)
What does a Telstra IP mean in a privacy test?
A Telstra address as your visible IP means the connection reached the site over an Australian Telstra line with nothing tunnelling it. Where the address appears matters, though: AS1221 also carries a large amount of transit, so the same ASN shows up as a hop in traceroutes for traffic that never touched a Telstra customer line.
Where to get Telstra's address list
Telstra publishes no range file, so the APNIC database is the source. The aut-num for AS1221 carries the AS name ASN-TELSTRA and the organisation Telstra Limited in Australia, registered on 4 September 2008 and last changed in May 2024, and the prefixes above are the largest currently announced. The AS1221 page carries the registry record with the routing detail.
The two address families are lopsided in the opposite direction from most carriers. AS1221 announces a few hundred IPv4 prefixes but only a couple of IPv6 ones, and one of those is 2001:8000::/20 - a single announcement covering a vast amount of space. So an IPv4 list of Telstra is a few hundred lines of maintenance and its IPv6 equivalent is effectively one line. A filter that has to catch both is easier to write against the ASN than against either list.
Retail line or transit hop
The reverse DNS separates the retail side cleanly. 101.160.1.1 answers as cpe-101-160-1-1.bpjl-r-036.lon.vic.bigpond.net.au: cpe marks customer premises equipment, the address follows in dashes, then an equipment identifier, an exchange label and a state code, then bigpond.net.au - BigPond being the consumer brand Telstra retired but never renamed out of its DNS. A name in that zone is a subscriber line in a named Australian state.
An AS1221 address without such a name is the other half of the network. CAIDA's AS Rank places AS1221 in the global top hundred by customer cone, reaching several hundred other networks, so its addresses appear mid-path for traffic between third parties as well as at the ends. Read the position, not just the ASN: as somebody's visible address it is a Telstra line, and as a traceroute hop it is Telstra's backbone carrying somebody else's traffic.
Related tools
Frequently asked questions
What IP ranges does Telstra use?
Telstra announces its network under AS1221, which APNIC registers to Telstra Limited under the AS name ASN-TELSTRA. The largest IPv4 blocks currently routed there are listed above, among them 1.128.0.0/11 and 101.160.0.0/11, and its IPv6 space is announced as 2001:8000::/20. No allowlist is published.
Why does a Telstra IP appear in my privacy test?
A Telstra address as your visible IP means the connection reached the site over an Australian Telstra line with nothing tunnelling it. Where the address appears matters, though: AS1221 also carries a large amount of transit, so the same ASN shows up as a hop in traceroutes for traffic that never touched a Telstra customer line.
Why does a Telstra IP have a bigpond.net.au hostname?
Because the zone outlived the brand. BigPond was Telstra's consumer internet name, and the reverse DNS kept it: 101.160.1.1 answers as cpe-101-160-1-1.bpjl-r-036.lon.vic.bigpond.net.au, where cpe marks customer premises equipment and vic is the state.
Is a Telstra address always a customer connection?
No, and the position tells you which. AS1221 is a large transit network as well as a retail ISP, so its addresses appear as hops in traceroutes for traffic between other networks. As somebody's visible address it is a Telstra line; mid-path it is Telstra's backbone.
Why does Telstra announce so few IPv6 prefixes?
Because one of them is enormous. 2001:8000::/20 covers a vast amount of space in a single announcement, so there is no need to deaggregate. Its IPv4 side is the opposite - a few hundred separate prefixes that have to be tracked individually.