CGNAT

Am I Behind CGNAT on Vi (Vodafone Idea)?

Vi, Vodafone Idea, appears in this site’s mobile list as two ASNs with one registry name. AS38266 and AS55410 are both VIL-AS-AP, checked 13 Oct 2026. Mobile carriers usually put many subscribers behind one public IPv4. That is the expectation on Vi. It is not a measurement of how many people share the address you happen to have today.

What this site is not claiming

These notes are about Vi mobile. This list does not describe a separate Vi fiber ASN. If the lookup shows a different ASN, you are not on Vi for that connection. Turn Wi-Fi off and run the CGNAT check again before you call support.

How to read the result

• ASN AS38266 or AS55410, connection type “mobile, likely shared”: the public IPv4 is probably CGNAT. Your phone’s own address will look private.
• An address in 100.64.0.0/10 on the device is the carrier’s shared range, not a leak and not a public address you can forward.
• IPv6, if it appears, is yours in a way the shared IPv4 is not. Many games and older services still want IPv4.

Support, and the thing not to buy

If you need inbound IPv4, ask Vi whether that plan can have a public IPv4. Expect a no on ordinary mobile. Do not pay a third party for a “Vi static IP”. A VPN moves you to a hosting ASN and makes datacenter checks stricter. For reaching your own machines, Tailscale or a tunnel does not need a public IPv4. Those options are on the CGNAT page.

ASNs and prefixes

These samples are from RIPEstat’s announced-prefixes API on 19 Oct 2026 (the data source). An announcement says the network is willing to receive traffic for that block. It does not say which city the block is used in, and it does not say whether your plan is behind CGNAT.

AS38266 VIL-AS-AP

On 19 Oct 2026, RIPEstat listed 775 IPv4 prefixes and 1,368 IPv6 prefixes announced by this ASN. The largest examples that day included 42.104.0.0/13, 1.38.0.0/17 and 2402:3a80:1080::/42. More-specifics move. Check RIPEstat or Hurricane Electric for the list as of today.

AS55410 VIL-AS-AP

On 19 Oct 2026, RIPEstat listed 1,272 IPv4 prefixes and 69 IPv6 prefixes announced by this ASN. The largest examples that day included 118.185.0.0/16, 123.63.0.0/16, 122.15.0.0/16 and 2400:c700:1000::/36. More-specifics move. Check RIPEstat or Hurricane Electric for the list as of today.

Other networks: Jio, Airtel, BSNL, ACT Fibernet. The shared checker is the CGNAT page. Indian context for all of these networks is on my IP address in India.