AS14778 — YAHOO

AS14778 announces 5 IPv4 prefixes covering 1,536 addresses and 9 IPv6 prefixes.

About this network

Nine IPv6 blocks from three continents, every one numbered from the same slice.

What it's used for

• Corporate and office network space for a large internet company. 1,536 IPv4 addresses across five prefixes, nine IPv6 prefixes, and two observed BGP neighbours.

Notable

• The IPv6 announcements come from three unrelated ranges, 2001:4998:ef6f::/48, 2406:6e00:ef98::/48 and 2a00:1288:efc1::/48 among them, and every one of the nine carries ef in the same position.
• Registry records span three regions: A-YAHOO-US11, CH-YAHOO, and YAHOOTWCIC and YAHOOISNET-AS-AP with an incident response team named as contact.
• All fifteen sampled addresses answered. Thirteen returned the identical name unknown.yahoo.com.
• The two exceptions are temp-clearpass1.net.corp.tw1.yahoo.com and nat-vpn-users9.cfw-a-usr.net.tw1.fy94.net.

Interesting

• The shared marker across nine blocks is one internal numbering plan applied on top of address space obtained from three different registries. The company decided what its own blocks would be called and then made the regional allocations fit, which is the sort of discipline only an organisation with a global addressing team manages.
• One wildcard name on every address is a reasonable way to publish nothing, and the two names that escaped it are more revealing than the thousands that did not. One marks a network access control appliance labelled as temporary; the other is a shared address for staff on the corporate virtual private network, published under an unbranded domain that gives no hint of the company.
• Naming a security incident team as registry contact on the regional records is the practice a network this size should follow everywhere.

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

Announced prefixes

• 77.238.175.0/24
• 117.104.190.0/23
• 184.165.10.0/24
• 202.174.4.0/24
• 203.83.216.0/24
• 2001:4998:ef6f::/48
• 2001:4998:ef84::/48
• 2406:2000:ef67::/48
• 2406:2000:efbc::/48
• 2406:2000:efbe::/48
• 2406:6e00:ef98::/48
• 2a00:1288:ef83::/48
• 2a00:1288:ef9b::/48
• 2a00:1288:efc1::/48

Upstream networks

• AS10310 Yahoo Holdings Inc.
• AS12400 Partner Communications Ltd.

Adjacent networks

• AS10310 Yahoo Holdings Inc.
• AS12400 Partner Communications Ltd.

Routing security

• RPKI: 0 valid, 0 invalid and 15 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 40% of announcements registered; 62 route objects.
• Listed in as-sets: AS-CATCHCOM, AS-GOLDEN, AS-HOTNET-IL, AS-HURRICANEV6, AS-TELSTRA-INTL-CUSTOMERS, AS-YAHOO, AS1221:AS-CUSTOMERS, AS2116:AS-GCNET.