AS21973 — XPONET

AS21973 announces 10 IPv4 prefixes covering 3,584 addresses and 3 IPv6 prefixes.

About this network

The AS handle XPONET is held by Xponet.

What it's used for

• The address space carries legacy UUNET and Verizon Business infrastructure, as indicated by netnames such as UUNET63, VZ, and UU-63-85-164.
• The AS announces 3840 IPv4 addresses across 11 prefixes and 4 IPv6 prefixes, with 6 observed neighbours, suggesting a small-scale enterprise or legacy network footprint.

Notable

• Registrants are predominantly Xponet, with the largest block 63.85.4.0/22 registered to Verizon Business under the netname UUNET63, reflecting historical ownership transitions.
• The inventory consists of finely subdivided /24 and /23 blocks, consistent with an internal corporate estate rather than a broad access network.

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

Announced prefixes

• 63.85.4.0/22
• 63.85.164.0/24
• 63.85.166.0/24
• 63.85.168.0/24
• 63.86.203.0/24
• 63.97.222.0/24
• 63.102.107.0/24
• 63.106.29.0/24
• 199.222.104.0/23
• 199.222.125.0/24
• 2602:ff18:221::/48
• 2602:ff18:241::/48
• 2602:ff18:242::/48

Upstream networks

• AS33132 Crown Castle Fiber LLC
• AS3356 Level 3 Parent, LLC
• AS11749 MPInet
• AS7018 AT&T Enterprises, LLC
• AS701 Verizon Business

Adjacent networks

• AS33132 Crown Castle Fiber LLC
• AS3356 Level 3 Parent, LLC
• AS11749 MPInet
• AS7018 AT&T Enterprises, LLC
• AS701 Verizon Business