AS13485 — GCU

AS13485 announces 5 IPv4 prefixes covering 53,248 addresses and 0 IPv6 prefixes.

About this network

A /16 announced as nineteen separate routes, every one of them registered as the same single object.

What it's used for

• A university's network. 53,248 addresses across nineteen IPv4 prefixes, two observed BGP neighbours, and no IPv6 announced.

Notable

• Every prefix sits inside 137.152, announced at sizes from a /18 down to /24s.
• All of them are netname GCU, registered to the university with a network operations contact.
• First seen in the routing archive on 2005-06-01, an actual date rather than the archive's start.
• Eighteen addresses were queried for reverse DNS and none returned a name.

Interesting

• Nineteen routes where one would carry the same traffic is a decision made inside the network and paid for by everyone else, since every router on the internet holds all nineteen. The usual reasons are splitting traffic across the two upstreams and making each piece separately visible.
• A university with a /16 and no IPv6 at all is unusual for a sector that adopted it early. Campus networks were among the first to get large allocations and among the first to run out of reasons to care, and an institution that never felt the pressure never made the change.
• Not one of eighteen sampled addresses answering means the reverse zone is unpopulated across the whole space. For a network this size that is a choice about what to publish, not an oversight.

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

Announced prefixes

• 137.152.0.0/19
• 137.152.32.0/20
• 137.152.64.0/18
• 137.152.128.0/18
• 137.152.192.0/19

Upstream networks

• AS209 CenturyLink Communications, LLC
• AS22773 Cox Communications Inc.

Adjacent networks

• AS209 CenturyLink Communications, LLC
• AS22773 Cox Communications Inc.