| Full name | AT&T Services Inc. |
| ASN | AS7018 |
| Type | Tier-1 ISP / Telecom |
| Country | United States |
| Headquarters | Dallas, Texas, US |
| Founded | 1983 |
| Website | att.com |
| Registry | ARIN |
| Total IPs | ~100 million (IPv4) |
| Upstream | Tier-1 — does not purchase transit, peers with all major networks |
| IPv6 | 2600:300::/28 |
| RIR | ARIN |
| Abuse email | abuse@att.net |
| Abuse form | Report abuse → |
AS7018 is AT&T's primary Tier-1 ISP ASN serving tens of millions of residential and business customers across the United States. AT&T is one of a handful of Tier-1 networks that forms the internet backbone — it does not pay for transit and peers directly with all other major networks. The 12.0.0.0/8 block alone contains over 16 million IP addresses and is one of the most recognisable ISP ranges in the US.
Every time you visit a website, your IP address — and therefore your ISP (AT&T Services Inc.) — is visible to that site. AT&T Services Inc. as your ISP can see all unencrypted traffic passing through their network, including the domains you visit. This is standard practice for all ISPs and is typically used for network management, legal compliance, and in some cases targeted advertising.
If your device is assigned an IP in AT&T Services Inc.’s ranges, websites you visit will identify your connection as coming from AT&T Services Inc.. To prevent this, a VPN replaces your ISP-assigned IP with the VPN server’s IP, making your traffic appear to come from a different provider entirely.
AS7018 is registered with ARIN — the Regional Internet Registry responsible for IP allocations in North America. The ASN is used to announce IP prefixes to the global BGP routing table, allowing other networks to route traffic to AT&T Services Inc.’s infrastructure.
AT&T Services Inc. peers with major transit providers and internet exchanges to ensure global reachability. BGP peering relationships determine how traffic flows between AT&T Services Inc. and the rest of the internet.
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