AS1321 — ANSBB-ASNNET-1

AS1321 announces 20 IPv4 prefixes covering 5,888 addresses and 4 IPv6 prefixes.

About this network

ANSBB-ASNNET-1, a backbone network of Advanced Network & Services (ANS), the organization that built and operated the NSFNET T3 backbone. It is now held by Verizon Business.

What it's used for

• Legacy backbone networking, now part of Verizon Business.

Notable

• ANS was central to the early US internet, operating the NSFNET backbone that seeded today's commercial internet.

Interesting

• See also AS1323, another ANS backbone allocation under the same handle.

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

Announced prefixes

• 152.196.4.0/22
• 152.196.8.0/24
• 152.196.10.0/24
• 152.196.12.0/24
• 152.196.14.0/24
• 152.196.16.0/24
• 152.196.18.0/24
• 152.196.20.0/24
• 152.196.22.0/24
• 152.196.26.0/24
• 152.196.28.0/24
• 152.196.68.0/24
• 152.196.70.0/24
• 152.196.72.0/24
• 152.196.74.0/24
• 152.196.100.0/24
• 152.196.102.0/24
• 152.196.104.0/24
• 152.196.106.0/24
• 152.196.121.0/24
• 2600:40ff:fc04::/48
• 2600:40ff:fc20::/45
• 2600:40ff:ff12::/47
• 2600:40ff:ff92::/47

Upstream networks

• AS701 Verizon Business
• AS703 Verizon Business
• AS702 Verizon Business
• AS1339 Verizon Business

Downstream networks

• AS10953 CONSTELLATION ENERGY GENERATION, LLC
• AS26662 XEROX CORPORATION
• AS4642 Cathay Pacific Airways Ltd.
• AS16224 Verizon UK Limited
• AS7046 Verizon Business
• AS26425 Exelon Corporation
• AS14799 Experian
• AS2830 Verizon Nederland B.V.
• AS11787 Supreme Court of Pennsylvania
• AS23503 Exelon Corporation
• AS395959 XEROX CORPORATION

Adjacent networks

• AS701 Verizon Business
• AS702 Verizon Business
• AS10953 CONSTELLATION ENERGY GENERATION, LLC
• AS703 Verizon Business
• AS26662 XEROX CORPORATION
• AS4642 Cathay Pacific Airways Ltd.
• AS16224 Verizon UK Limited
• AS7046 Verizon Business
• AS26425 Exelon Corporation
• AS14799 Experian
• AS23503 Exelon Corporation
• AS2830 Verizon Nederland B.V.
• AS11787 Supreme Court of Pennsylvania
• AS395959 XEROX CORPORATION
• AS1339 Verizon Business