AS15307 — CHILDRENS-SEATTLE

AS15307 announces 1 IPv4 prefixes covering 65,536 addresses and 0 IPv6 prefixes.

About this network

Half the allocation goes as one route; the other half is broken into twenty-one.

What it's used for

• A paediatric hospital and research centre's network. Twenty-two IPv4 prefixes announced from the United States, no IPv6, and three observed BGP neighbours.

Notable

• All twenty-two announcements fall inside one contiguous allocation, and together they cover all sixty-five thousand of its addresses.
• The lower half is carried as a single route. The upper half is split into twenty-one routes ranging from a /19 down to individual /24 blocks.
• Every block carries the same netname, three letters for the city and one word for the hospital, so the registry gives no clue why the split exists.
• The registrant appends a network engineer role after a semicolon.
• Eighteen addresses were queried for reverse DNS and none returned a name.

Interesting

• Twenty-one routes where one would do is traffic engineering, not carelessness: with three upstreams, each piece can be steered separately, and a hospital that cannot lose connectivity will trade routing table space for control.
• The cost is carried by everyone else. Each of those routes takes an entry in every full routing table on the internet, for one organisation's internal preferences.
• Publishing nothing in reverse across the whole range is consistent for a network carrying clinical systems and research data. The routes reveal the structure; the names reveal nothing.

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

Announced prefixes

• 146.79.0.0/16

Upstream networks

• AS6461 Zayo Bandwidth
• AS33650 Comcast Cable Communications, LLC
• AS209 CenturyLink Communications, LLC

Adjacent networks

• AS6461 Zayo Bandwidth
• AS33650 Comcast Cable Communications, LLC
• AS209 CenturyLink Communications, LLC