Yahoo Holdings Inc.

Data as of 2026-08-09
BGP inherited
Complete entity footprint
3 linked clusters · 4,344 netblocks · 31,624,864 IPv4 addresses · 304 IPv6 prefixes
This organisation's clusters combined by evidence — shared operating domain yahoo.com — not name similarity, so genuinely different organisations that share a name are excluded.
View the full entity page →
Cluster stats
Netblocks893 · 1,179,500 IPv4 addresses
IPv6 252 prefixes (largest 2001:4998::/32)
Registered in United States (398) · Hong Kong (76) · Singapore (32) · Japan (29) · United Kingdom (24) · Taiwan (10)
All fragments 1,127 blocks across 41 clusters
Cluster ID217745281
RegistryAFRINIC
Customersfind customers using this network →
Evidence & provenance ?
Attribution BGP parent (inherited)
Shared handles clustered on 73 shared RIR contact/maintainer handles
Registry names 17 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue

Footprint over time

7 weekly snapshots · JSON
909 -1 netblocks since 2026-07-05
2026-07-05 peak 913 2026-08-09

IP Ranges (893)

showing 50 of 893 — see all — ⬇ export CSV (free export limited to 500 rows — subscribe for the full export)
CIDR Org name Registry Status Confidence
5.57.81.130/32 Yahoo PEERINGDB ASSIGNED ● high
5.57.81.131/32 Yahoo PEERINGDB ASSIGNED ● high
27.111.228.3/32 Yahoo PEERINGDB ASSIGNED ● high
27.111.228.131/32 Yahoo PEERINGDB ASSIGNED ● high
27.123.33.0/24 Yahoo Holdings Inc. BGP ANNOUNCED ● high
27.123.34.0/23 Yahoo Holdings Inc. BGP ANNOUNCED ● high
27.123.37.0/24 Yahoo Holdings Inc. BGP ANNOUNCED ● high
27.123.42.0/24 Yahoo Inc. BGP ANNOUNCED ● high
27.123.43.0/24 Yahoo Inc. BGP ANNOUNCED ● high
27.123.44.0/22 Yahoo Holdings Inc. BGP ANNOUNCED ● high
27.123.60.0/24 Yahoo Holdings Inc. BGP ANNOUNCED ● high
27.123.61.0/24 Yahoo Holdings Inc. BGP ANNOUNCED ● high
27.123.192.0/23 Yahoo Holdings Inc. BGP ANNOUNCED ● high
27.123.196.0/23 Yahoo Holdings Inc. BGP ANNOUNCED ● high
27.254.19.246/32 Yahoo PEERINGDB ASSIGNED ● high
34.2.64.0/22 Yahoo Holdings Inc. ARIN ALLOCATION ● high
34.2.68.0/23 Yahoo Holdings Inc. ARIN ALLOCATION ● high
34.2.70.0/23 Yahoo Holdings Inc. ARIN ALLOCATION ● high
34.2.72.0/22 Yahoo Holdings Inc. ARIN ALLOCATION ● high
34.2.78.0/23 Yahoo Holdings Inc. ARIN ALLOCATION ● high
34.2.80.0/23 Yahoo Holdings Inc. ARIN ALLOCATION ● high
34.2.82.0/23 Yahoo Holdings Inc. ARIN ALLOCATION ● high
34.2.84.0/24 Yahoo Holdings Inc. ARIN ALLOCATION ● high
34.2.85.0/24 Yahoo Holdings Inc. ARIN ALLOCATION ● high
34.2.86.0/23 Yahoo Holdings Inc. ARIN ALLOCATION ● high
34.2.88.0/23 Yahoo Holdings Inc. ARIN ALLOCATION ● high
34.2.90.0/23 Yahoo Holdings Inc. ARIN ALLOCATION ● high
34.2.92.0/23 Yahoo Holdings Inc. ARIN ALLOCATION ● high
34.2.94.0/23 Yahoo Holdings Inc. ARIN ALLOCATION ● high
36.255.56.64/32 Yahoo PEERINGDB ASSIGNED ● high
36.255.56.147/32 Yahoo PEERINGDB ASSIGNED ● high
37.49.232.52/32 Yahoo PEERINGDB ASSIGNED ● high
37.49.232.53/32 Yahoo PEERINGDB ASSIGNED ● high
37.49.237.5/32 Yahoo PEERINGDB ASSIGNED ● high
45.127.172.163/32 Yahoo PEERINGDB ASSIGNED ● high
45.127.172.175/32 Yahoo PEERINGDB ASSIGNED ● high
62.69.146.144/32 Yahoo PEERINGDB ASSIGNED ● high
63.250.192.0/19 Yahoo Holdings Inc. BGP ANNOUNCED ● high
63.250.196.0/22 Yahoo Holdings Inc. BGP ANNOUNCED ● high
63.250.200.0/21 Yahoo Holdings Inc. BGP ANNOUNCED ● high
63.250.204.0/22 Yahoo Holdings Inc. BGP ANNOUNCED ● high
63.250.207.0/24 Yahoo Holdings Inc. BGP ANNOUNCED ● high
66.94.224.0/19 Yahoo Holdings Inc. ARIN DIRECT ALLOCATION ● high
66.163.160.0/19 Yahoo Holdings Inc. ARIN DIRECT ALLOCATION ● high
66.163.168.0/21 Yahoo Holdings Inc. BGP ANNOUNCED ● high
66.163.176.0/21 Yahoo Holdings Inc. BGP ANNOUNCED ● high
66.163.184.0/21 Yahoo Holdings Inc. BGP ANNOUNCED ● high
66.196.64.0/21 Yahoo Holdings Inc. BGP ANNOUNCED ● high
66.196.64.0/18 Yahoo Holdings Inc. ARIN DIRECT ALLOCATION ● high
66.196.70.0/23 Yahoo Holdings Inc. BGP ANNOUNCED ● high

IPv6 ranges (252)

showing the 15 largest allocations
CIDR
2001:4998::/32
2001:49a0::/32
2001:49a8::/32
2001:4b0::/32
2406:2000::/32
2406:6e00::/32
2804:1bc::/32
2a00:1288::/32
2a03:cd00::/32
2001:4998:f000::/36
2620:113:7000::/44
2001:4998:124::/46
2001:4998:194::/46
2001:4998:198::/46
2001:4998:19c::/46

Domains hosted in this network

what's this?
yahoo.com yahoo.co.jp yimg.jp line.me line-apps.com fivecdm.com yahooapis.jp line-scdn.net akadns.net yjtag.jp lin.ee yahoo.jp yahoodns.net livedoor.jp storage-yahoo.jp yahoo.net line.biz livedoor.com naver.jp

Customer-delegated space

how is this classified?
Unclassified 605 (67.7%)
Operator infrastructure (named) 304 (34.0%)

Network trust

what's this?
RPKI hygiene: D how networks compare →
30.3% of checked blocks have valid RPKI ROA coverage (275 of 909)
Possible discrepancies (14)

These blocks are registered to Yahoo Holdings Inc. but cryptographically authorized for a different, unrelated network (1 distinct holder) — often M&A history, multi-homing, or outsourced/managed hosting, occasionally worth a closer look.

34.2.64.0/22 /22 authorized for AS15169 — Google LLC
34.2.72.0/22 /22 authorized for AS15169 — Google LLC
34.2.68.0/23 /23 authorized for AS15169 — Google LLC
34.2.70.0/23 /23 authorized for AS15169 — Google LLC
34.2.78.0/23 /23 authorized for AS15169 — Google LLC
34.2.80.0/23 /23 authorized for AS15169 — Google LLC
34.2.82.0/23 /23 authorized for AS15169 — Google LLC
34.2.86.0/23 /23 authorized for AS15169 — Google LLC
34.2.88.0/23 /23 authorized for AS15169 — Google LLC
34.2.90.0/23 /23 authorized for AS15169 — Google LLC
34.2.92.0/23 /23 authorized for AS15169 — Google LLC
34.2.94.0/23 /23 authorized for AS15169 — Google LLC
34.2.84.0/24 /24 authorized for AS15169 — Google LLC
34.2.85.0/24 /24 authorized for AS15169 — Google LLC

NIC Handles

APNIC-HM AS10229 AS10230 AS10310 AS10310 AS10880 AS12301-MNT AS14196 AS14776 AS14777 AS14778 AS14779 +61 more