AS26101 — YAHOO-BF1

AS26101 announces 27 IPv4 prefixes covering 121,344 addresses and 4 IPv6 prefixes.

About this network

YAHOO-BF1 is the autonomous system for Yahoo Holdings Inc.

What it's used for

• The address space carries internal corporate infrastructure, evidenced by reverse DNS entries such as et15-1.fab8-2-gdc.bf1.yahoo.com and 254.183.139.98.aprez.ostk.prod.bf1.yahoo.com.
• The AS announces 121,344 IPv4 addresses across 72 prefixes and 4 IPv6 prefixes, maintaining a single observed neighbour, which indicates a large internal corporate estate rather than a transit or access network.

Notable

• All registrants for the largest prefixes are listed as Yahoo Holdings Inc., with netnames including A-YAHOO-US9, A-YAHOO-U23, and INKTOMI-BLK-4.
• The presence of INKTOMI netnames reflects the historical acquisition of Inktomi by Yahoo, which provided the underlying infrastructure for Yahoo's web services.
• The inventory consists of finely subdivided /20 and /21 blocks, consistent with site-by-site segmentation for a major technology company.

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

Announced prefixes

• 63.250.196.0/22
• 63.250.200.0/22
• 66.196.80.0/21
• 66.196.88.0/23
• 66.196.104.0/21
• 66.196.112.0/21
• 66.218.80.0/20
• 67.195.176.0/20
• 67.195.192.0/19
• 68.142.216.0/21
• 68.142.224.0/20
• 69.147.72.0/21
• 69.147.112.0/20
• 72.30.0.0/18
• 72.30.192.0/20
• 74.6.48.0/22
• 74.6.96.0/19
• 74.6.128.0/20
• 74.6.144.0/21
• 74.6.248.0/21
• 98.137.192.0/21
• 98.139.8.0/22
• 98.139.16.0/20
• 98.139.32.0/20
• 98.139.124.0/22
• 98.139.128.0/17
• 209.73.180.0/22
• 2001:4998:58::/46
• 2001:4998:124::/46
• 2001:4998:194::/46
• 2001:4998:ef99::/48

Upstream networks

• AS10310 Yahoo Holdings Inc.

Adjacent networks

• AS10310 Yahoo Holdings Inc.