Telkom IP address & ASN guide
Telkom is South Africa’s incumbent telecoms company. Its main network, AS37457, is by far the largest in the country by number of announced IPv4 prefixes, carrying Telkom fibre and DSL customers and much of Telkom Mobile’s traffic. Openserve, Telkom’s wholesale fibre and copper arm, is part of the same group.
What your IP says
- Your IP
- 216.73.217.116
- Network
- Anthropic, PBC (AS16509)
You don’t appear to be on Telkom right now — your IP belongs to Anthropic, PBC.
Telkom ASNs and IP ranges
- AS37457
- Telkom SA Ltd. (Telkom Internet) · 1,667 IPv4 / 34 IPv6 prefixes originated
- AS37251
- Telkom SA Ltd. (Telkom Mobile) · 3 IPv4 / 0 IPv6 prefixes originated
An ASN (autonomous system number) identifies a network on the internet. Any IP address announced by these ASNs belongs to Telkom. Paste an address into the IP lookup to see which ASN it falls under.
CGNAT on Telkom
Telkom Mobile and LTE customers are typically behind CGNAT. Telkom fibre customers often receive a public IPv4 address on the router, but it is usually dynamic and can change after a reconnect. If your router’s WAN address starts with 100.64–100.127 you are behind CGNAT.
To check: compare your router’s WAN address with the IP on FernTool. If they differ, or the WAN IP is in 100.64.0.0/10, you are behind CGNAT. More on CGNAT.
How to find your IP on Telkom
- Public IP: open ferntool.com or run
curl https://www.ferntool.com. - Private IP and router address: see how to find your IP on Windows, Mac, iPhone and Android.
- IPv6: run the IPv6 test.
Good to know
Telkom announces IPv6 prefixes too; run the IPv6 test to see whether your line has IPv6 enabled.
Frequently asked questions
What is Telkom’s ASN?
Telkom announces its IP addresses from AS37457, AS37251, with AS37457 the largest by IPv4 prefixes (bgp.he.net, 16 October 2026).
Does Telkom use CGNAT?
Telkom Mobile and LTE customers are typically behind CGNAT. Telkom fibre customers often receive a public IPv4 address on the router, but it is usually dynamic and can change after a reconnect. If your router’s WAN address starts with 100.64–100.127 you are behind CGNAT.
How do I find my Telkom IP address?
Open www.ferntool.com on a device connected through Telkom. The page shows your public IP, the network that owns it and its ASN. For your private IP, check your device’s Wi-Fi settings.
Why does my Telkom IP show a different city?
IP geolocation is approximate. South African networks often register address blocks to a head office or a large city, so the city shown may not be where you are. The country and network are much more reliable.
Other South African networks
Vodacom · MTN · Cell C · Rain · Afrihost · Cool Ideas · Vumatel · Openserve · Webafrica
ASN data from bgp.he.net and IPtoASN, checked 16 October 2026. FernTool is not affiliated with Telkom.