Autonomous system
AS13485 GCU
Unclassified ARIN
Summary
Grand Canyon University
education business infrastructure
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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-28, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 19 prefixes · 53.25K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 19 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS13485- Registry name
- GCU
- Registrant
- Grand Canyon University
- Abuse contact
- itsecurity@gcu.edu
- Registered
- 2009-10-27
- Last changed
- 2011-12-07
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 11 with no ROA
- ROAs
- 0 authorising AS13485
- ASPA
- no ASPA record
- IRR
- 36% registered · 4 of 11 announcements
- Route objects
- 4 naming AS13485
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 448 networks and 1,849 prefixes, as published 2026-10-29. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere