asn.dev

Autonomous system

AS18693 UCH-CENTRAL - University of Colorado Hospital

Unclassified ARIN

IPv4 addresses 1.28K 4 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 4 0 downstream
Flagged prefixes 0 none

Summary

University of Colorado Hospital

United States of America · AI-generated

healthcare business education us

UCH-CENTRAL is operated by University of Colorado Hospital.

What it's used for

  • The address space is primarily associated with the hospital, evidenced by netnames UCH on three of the four prefixes.
  • One prefix, 24.155.10.0/24, carries the netname GRANDECOM-GRANDECOMMUNICATIONS and reverse DNS records pointing to static.grandenetworks.net, indicating a distinct telecommunications or leased segment within the AS.
  • The AS announces 1280 IPv4 addresses across 4 prefixes and maintains 4 observed neighbours, a ratio consistent with a site-specific or enterprise network rather than a large-scale transit provider.

Notable

  • Registrants for the majority of the space are listed as "University of Colorado Hospital; Senior Network Engineer," while the 24.155.10.0/24 block is registered to "Grande Communications."
  • The University of Colorado Hospital was formerly named Colorado General Hospital and serves as the principal teaching hospital for the University of Colorado School of Medicine.
  • The inventory consists of three blocks in the 168.200.0.0/16 range and one isolated block in the 24.0.0.0/8 range.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

4 upstream, 0 downstream and 4 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS3356Level 3 Parent, LLC88
AS209CenturyLink Communications, LLC60
AS7459Grande Communications Networks, LLC58
AS6461Zayo Bandwidth32

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-04, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 4 prefixes · 1.28K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America4

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS18693
Registry name
UCH-CENTRAL
Registrant
University of Colorado Hospital
Abuse contact
dnsadmins@uchealth.org
Registered
2013-06-04
Last changed
2013-06-04
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 4 with no ROA
ROAs
0 authorising AS18693
ASPA
no ASPA record
IRR
0% registered · 0 of 4 announcements 1 other origin
Route objects
0 naming AS18693

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: 452 networks and 1,853 prefixes, as published 2026-11-05. 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

Cross-check