Autonomous system
AS11687 CITY-OF-HOPE
Unclassified ARIN
Summary
City of Hope Medical Center
enterprise research legacy
CITY-OF-HOPE is the enterprise network of City of Hope, the cancer treatment and biomedical research centre headquartered in Duarte, California. It is a single-site institutional network, not a service provider.
What it's used for
- Carrying City of Hope's own hospital, clinic and research-campus traffic: four IPv4 prefixes totalling 16,640 addresses, all of it registered to City of Hope Medical Center itself, all of it announced by City of Hope's own AS.
Notable
- The routing shape backs the "enterprise" reading rather than any provider role. RIS sees only 3 observed neighbours against those four prefixes. A carrier or hosting operator of comparable address size would peer with dozens to hundreds of ASes; a handful of upstreams is what a large institution with multihomed internet service looks like.
- Every prefix registers to org City of Hope Medical Center (handle
COH), including the two/19s. Self-registered space announced by the matching AS is the cleanest possible signal that this is a real operator running its own address space, not an ASN fronting third-party inventory. - No IPv6 is announced.
Interesting
- The blocks are contiguous inside
151.152.0.0/16-adjacent space, consistent with a single organisation that grew one allocation rather than accreting acquisitions. - No PTRs were returned on the addresses sampled. That is a sample, not a finding: it says nothing about whether the reverse zone is delegated, and nothing about what the space carries. The registrant data, not the rDNS, is what identifies this network.
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 2026-10-26, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 6 prefixes · 16.64K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 6 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11687- Registry name
- CITY-OF-HOPE
- Registrant
- City of Hope Medical Center
- Abuse contact
- ARIN-POC@coh.org
- Registered
- 1998-11-16
- Last changed
- 2012-03-02
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 4 with no ROA
- ROAs
- 0 authorising AS11687
- ASPA
- 1 declared providers
- IRR
- 100% registered · 4 of 4 announcements
- Route objects
- 4 naming AS11687
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: 446 networks and 1,852 prefixes, as published 2026-10-27. 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