AS20138 — CTHS-ASN-20138

AS20138 announces 1 IPv4 prefixes covering 256 addresses and 0 IPv6 prefixes.

About this network

CTHS-ASN-20138 is held by Carson Tahoe Health System.

What it's used for

• The space carries a single IPv4 block, 12.139.152.0/24, registered under the netname ATTWORLD26 with registrant AT&T Services, Inc.
• The AS announces 256 IPv4 addresses across 1 prefix and maintains 1 observed neighbour, indicating a small, isolated internal network rather than a transit or access provider.

Notable

• The RDAP registrant AT&T Services, Inc. differs from the AS holder Carson Tahoe Health System, suggesting the address space is leased or historically allocated by AT&T.
• Carson Tahoe Health is a not-for-profit healthcare system in Carson City, Nevada, and an affiliate of University of Utah Health.
• The inventory consists of a single /24 block with no IPv6 prefixes announced.

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

Announced prefixes

• 12.139.152.0/24

Upstream networks

• AS23222 Charter Communications LLC
• AS7018 AT&T Enterprises, LLC

Adjacent networks

• AS23222 Charter Communications LLC
• AS7018 AT&T Enterprises, LLC