AS11687 — CITY-OF-HOPE

AS11687 announces 3 IPv4 prefixes covering 16,640 addresses and 0 IPv6 prefixes.

About this network

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.

Announced prefixes

• 151.152.92.0/24
• 151.152.96.0/19
• 151.152.128.0/19

Upstream networks

• AS20001 Charter Communications Inc
• AS20454 SECURED SERVERS LLC
• AS46887 Crown Castle Fiber LLC
• AS3356 Level 3 Parent, LLC

Adjacent networks

• AS20001 Charter Communications Inc
• AS20454 SECURED SERVERS LLC
• AS46887 Crown Castle Fiber LLC
• AS3356 Level 3 Parent, LLC