AS14780 — YAHOO

AS14780 announces 2 IPv4 prefixes covering 768 addresses and 1 IPv6 prefixes.

About this network

One block is numbered into a series, the other is named after something the company bought.

What it's used for

• One of a run of numbers a large web company uses for its edge sites. 768 IPv4 addresses across two prefixes, one IPv6 prefix, and one observed BGP neighbour.

Notable

• 68.180.134.0/23 carries the netname A-YAHOO-US6, the sixth entry in a numbered series.
• 209.73.189.0/24 carries INTERNET-BLK-1-AV, which follows no such scheme and ends in two letters naming a different product.
• Two of the six sampled addresses answer as router interfaces, et18-1.bas3-1-edg.mib.yahoo.com and et51.rsw6-1-edg.mib.yahoo.com.
• The other four answer as unknown.yahoo.com.

Interesting

• Those two interface names appear, digit for digit, under other numbers in this same run, with only the three-letter site code changed. The naming is generated from a template applied identically at every site, so the same port on the same box has the same name everywhere and the location is the only variable.
• A wildcard answering everything else as unknown is a way of publishing that an address exists without publishing what it does. It satisfies software that insists on a reverse name and tells a stranger nothing.
• The block whose netname breaks the pattern is the older one, inherited with a product rather than requested as part of a numbering plan. Nobody renamed it, because the name still resolves to the right owner.
• One observed upstream for an edge site is normal: these announcements exist to be heard locally, not to be carried far.

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

Announced prefixes

• 68.180.134.0/23
• 209.73.189.0/24
• 2001:4998:3c::/48

Upstream networks

• AS10310 Yahoo Holdings Inc.

Adjacent networks

• AS10310 Yahoo Holdings Inc.