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Network · ASN lookup

AS1221: Telstra

AS1221 belongs to Telstra and is registered in Australia.

Facts about AS1221

Dataset read 2026-11-01 What the public iptoasn.com dataset held for AS1221 on the day this copy was read. It is refreshed about once a month. IPv4 only

AS number

AS1221

Registered descriptionASN-TELSTRA Telstra Limited

AUAustralia
IPv4 addresses The addresses in all 191 of its ranges. The share is that total over the 4,294,967,296 addresses of the whole IPv4 space.
13,386,240
0.31% of the whole IPv4 space
IPv4 ranges
191
Kind of network
Broadband and mobile
Hosting network Yes only when the AS number is on our list of hosting and cloud networks. Not on our list says nothing about what kind of network it is.
Not on our list

The 15 largest ranges below hold 92.7% of its addresses Each segment is one of the ranges listed below, drawn at its share of all 13,386,240 addresses of AS1221. The empty part is every other range. 12,402,688 of 13,386,240

Country: Australia (AU), as the registry holds it. Where the network is registered, which is not always where its customers are. Open AS1221 in the ASN lookup

Largest IPv4 ranges of AS1221

Each bar is the range's address count against the largest one. A prefix such as /12 shows when a range is exactly one aligned CIDR block.

The 15 largest of 191, biggest first

Largest IPv4 ranges of AS1221, with the number of addresses in each
#First address to last addressSize against the largest rangeAddresses
011.120.0.0 to 1.159.255.2552,621,440
02101.167.224.0 to 101.191.255.2551,581,056
03203.35.0.0 to 203.54.255.2551,310,720
0458.160.0.0 to 58.175.255.255/121,048,576
05121.208.0.0 to 121.223.255.255/121,048,576
06124.176.0.0 to 124.191.255.255/121,048,576
07120.144.0.0 to 120.158.255.255983,040
08110.140.0.0 to 110.151.255.255786,432
0960.224.0.0 to 60.231.255.255/13524,288
10101.160.0.0 to 101.167.175.255503,808
11144.130.144.0 to 144.137.255.255487,424
12123.209.0.0 to 123.211.255.255196,608
13144.139.0.0 to 144.140.255.255131,072
14101.103.0.0 to 101.103.255.255/1665,536
15125.255.0.0 to 125.255.255.255/1665,536

Other networks in Australia

AS7545TPG

Using this network with a proxy

It targets that one network, and it is not applied on geo-forced pools. If no exit on the network is available, the request fails instead of falling back to another network. We do not publish which networks are available at a given time.

A request names it with the asn option, written AS1221 or 1221. Every pool takes it: Essential and Premium Residential, and Mobile.

Essential and Premium