AS4468 — EASYLINK4 - AT&T Enterprises, LLC

AS4468 announces 5 IPv4 prefixes covering 1,536 addresses and 0 IPv6 prefixes.

About this network

An AT&T autonomous system registered with ARIN in 1995 and held today by AT&T Enterprises, LLC, under the legacy EASYLINK4 handle.

What it's used for

• Announcing a handful of AT&T prefixes, mostly out of 204.127.0.0/16, in support of AT&T-run services.
• A small, special-purpose ASN — not one of AT&T's major transit or consumer broadband networks.

Notable

• The address space is corporate rather than residential: these routes back AT&T's own service infrastructure, not home subscriber pools.
• Sibling of AS4466, which carries the matching EASYLINK2 handle from the same registration batch.

Interesting

• The EasyLink name traces back to the electronic messaging, fax, and telex business AT&T bought from Western Union in 1990. The product line eventually moved on to other companies; the AS handle did not.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 204.127.240.0/23
• 204.127.242.0/24
• 204.127.245.0/24
• 204.127.249.0/24
• 204.127.251.0/24

Upstream networks

• AS2686 AT&T Enterprises, LLC
• AS2687 AT&T Enterprises, LLC

Adjacent networks

• AS2686 AT&T Enterprises, LLC
• AS2687 AT&T Enterprises, LLC

Routing security

• RPKI: 0 valid, 0 invalid and 6 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 17 route objects.
• Listed in as-sets: AS-ATT2688-REG, AS-ATTAP, AS-CTBC-TOOLS-7, AS-IGNEMEA, AS1221:AS-CUSTOMERS, AS3491:AS-CUSTOMERS-AP, AS3491:AS-CUSTOMERS-TEST, AS7545:AS-TPGN-CUSTOMERS.