asn.dev

Autonomous system

AS56173 YAHOO-SG3 internet content provider

Unclassified APNIC

IPv4 addresses 36.35K 32 prefixes
IPv6 prefixes 4 counted as prefixes, not addresses
Countries 1 mostly SG
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

Yahoo

Singapore · AI-generated

business content apac infrastructure

The AS handle YAHOO-SG3 is held by Yahoo Inc.

What it's used for

  • The address space carries internal corporate infrastructure, evidenced by netnames SG3 and YAHOO-APAC and reverse DNS entries such as 254.171.10.106.aprez.ostk.prod.sg3.yahoo.com.
  • The AS announces 36,352 IPv4 addresses across 32 prefixes and 4 IPv6 prefixes, with only 1 observed neighbour, indicating a dedicated internal estate rather than a transit or access network.
  • Traffic from this AS consists of web and API endpoints for Yahoo's Asia-Pacific operations, specifically within the Singapore region.

Notable

  • All registrants in the sample are YAHOO INC with IRT contact IRT-YAHOO-AP, fully consistent with the announcer.
  • Yahoo Inc. was rebranded from Verizon Media following its acquisition by Apollo Global Management in 2021.
  • The inventory is dominated by the 106.10.0.0/16 range, with smaller allocations in 202.43.0.0/16 and 202.165.0.0/16.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.

Interconnection

Peering at a glance

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

1 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS10310Yahoo Holdings Inc.1,668

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-18, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 32 prefixes · 36.35K addresses IPv6 4 prefixes

CountryNamePrefixes
SGSingapore36

Registry

Allocation record

APNIC · via Atlas (registry + RDAP)
Registry
APNIC
Handle
AS56173
Registry name
YAHOO-SG3
Registrant
Yahoo Inc.
Abuse contact
rir-admin@yahooinc.com
Registered
2011-03-28
Last changed
2021-01-11
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 31 with no ROA
ROAs
0 authorising AS56173
ASPA
no ASPA record
IRR
100% registered · 31 of 31 announcements
Route objects
35 naming AS56173

Reputation

Classification and threat

Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.

Spamhaus DROP

Not on ASN-DROP The network as a whole is not listed.

No DROP prefixes None of its announced space is on the DROP prefix list.

Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 443 networks and 1,784 prefixes, as published 2026-10-19. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.

FBI IC3

No IC3 indicators Nothing from the FBI IC3 feed.

IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.

Elsewhere

Cross-check