$ query “AS55900” --type=asn → 1 result(s)

AS55900 · GLBB-JP

GLBB Japan KK

AS55900 is owned by GLBB Japan KK and is a mid-size transit provider, based in Japan. The system announces a respectable 41 728 IPv4 addresses, and supports IPv6. The bulk of its IP address space is in Japan.

  • #4 in Japan — Top 10 by reach within country

Basic Information

Country
🇯🇵 Japan
Category
Hosting
Network Role
Mid-size Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Last Changed
March 04, 2026
Last Seen
April 29, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
27 / 18
IPv6 Prefixes (raw / aggregated)
1 / 1
IPv4 Addresses
41 728
Largest IPv4 Prefix
/19 (8 192 addresses)
Largest IPv6 Prefix
/32
Geolocated Countries
🇯🇵 Japan (67 072 IPs)
Prefix Changed
March 04, 2026

Reputation

Reputation
Good — 1 flagged IPs out of 41 728 total (0.00%)

Connectivity Summary

Upstream Providers
4 upstreams providing transit
Peers
15 networks exchanging traffic without transit
Downstream Customers
8 downstreams buying transit
Unclassified
1 unclassified BGP neighbor
Degree
28 unique BGP neighbors
Reach
4 270 networks in customer cone

Upstream Providers (4)

  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS1299 — TWELVE99 (Tier-1 transit)
  • AS2914 — NTT-DATA-2914 (Tier-1 transit)
  • AS2497 — IIJ

Prefix Lists

IPv4 Prefixes (27 total)

  • 180.131.224.0/19 (8 192 addresses (/19 prefix))
  • 27.0.16.0/20 (4 096 addresses (/20 prefix))
  • 198.144.128.0/20 (4 096 addresses (/20 prefix))
  • 180.131.208.0/20 (4 096 addresses (/20 prefix))
  • 137.220.16.0/20 (4 096 addresses (/20 prefix))
  • 109.236.0.0/20 (4 096 addresses (/20 prefix))
  • 218.223.128.0/21 (2 048 addresses (/21 prefix))
  • 202.171.224.0/21 (2 048 addresses (/21 prefix))
  • 123.100.136.0/22 (1 024 addresses (/22 prefix))
  • 123.100.156.0/22 (1 024 addresses (/22 prefix))
  • 103.250.92.0/22 (1 024 addresses (/22 prefix))
  • 103.13.248.0/22 (1 024 addresses (/22 prefix))
  • 202.12.244.0/22 (1 024 addresses (/22 prefix))
  • 103.7.88.0/22 (1 024 addresses (/22 prefix))
  • 203.23.200.0/22 (1 024 addresses (/22 prefix))
  • 43.248.160.0/22 (1 024 addresses (/22 prefix))
  • 103.100.190.0/23 (512 addresses (/23 prefix))
  • 103.100.189.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (1 total)

  • 2404:2d00::/32