$ query “AS2497” --type=asn → 1 result(s)

AS2497 · IIJ

Internet Initiative Japan Inc.

AS2497 belongs to Internet Initiative Japan Inc. and is a major transit provider, established in Japan. The system announces an impressive 3.9 million IPv4 addresses, including a /15, and supports IPv6. Its primary geographic footprint is in Japan, with additional presence in Australia and the United States, and a smaller footprint in another country. This AS has recently updated its prefix announcements.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • #2 in Japan — Top 10 by reach within country

Basic Information

Country
🇯🇵 Japan
Category
Internet Service Provider
Network Role
Major Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Last Changed
March 04, 2026
Last Seen
June 22, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
193 / 150
IPv6 Prefixes (raw / aggregated)
11 / 8
IPv4 Addresses
3 916 032
Largest IPv4 Prefix
/15 (131 072 addresses)
Largest IPv6 Prefix
/32
Geolocated Countries
🇯🇵 Japan (5 077 552 IPs), 🇦🇺 Australia (87 808 IPs), 🇺🇸 United States (12 544 IPs) and 1 more
Prefix Changed
June 18, 2026

Reputation

Reputation
Good — 4 flagged IPs out of 3 916 032 total (0.00%)
Open Proxies
1 known open proxies in this network

Connectivity Summary

Upstream Providers
5 upstreams providing transit
Peers
129 networks exchanging traffic without transit
Downstream Customers
200 downstreams buying transit
Unclassified
1 unclassified BGP neighbor
Degree
335 unique BGP neighbors
Reach
32 581 networks in customer cone

Upstream Providers (5)

  • AS174 — COGENT (Tier-1 transit)
  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS2914 — NTT-DATA-2914 (Tier-1 transit)
  • AS701 — UUNET (Tier-1 transit)
  • AS5511 — OPENTRANSIT (Tier-1 transit)

Prefix Lists

IPv4 Prefixes (193 total)

  • 172.122.0.0/15 (131 072 addresses (/15 prefix))
  • 210.148.0.0/15 (131 072 addresses (/15 prefix))
  • 133.110.0.0/15 (131 072 addresses (/15 prefix))
  • 133.254.0.0/16 (65 536 addresses (/16 prefix))
  • 133.245.0.0/16 (65 536 addresses (/16 prefix))
  • 160.13.0.0/16 (65 536 addresses (/16 prefix))
  • 157.67.0.0/16 (65 536 addresses (/16 prefix))
  • 167.169.0.0/16 (65 536 addresses (/16 prefix))
  • 163.49.0.0/16 (65 536 addresses (/16 prefix))
  • 202.32.0.0/16 (65 536 addresses (/16 prefix))
  • 150.90.0.0/16 (65 536 addresses (/16 prefix))
  • 150.87.0.0/16 (65 536 addresses (/16 prefix))
  • 202.214.0.0/16 (65 536 addresses (/16 prefix))
  • 202.221.0.0/16 (65 536 addresses (/16 prefix))
  • 219.119.0.0/16 (65 536 addresses (/16 prefix))
  • 150.31.0.0/16 (65 536 addresses (/16 prefix))
  • 150.23.0.0/16 (65 536 addresses (/16 prefix))
  • 202.232.0.0/16 (65 536 addresses (/16 prefix))
  • 143.94.0.0/16 (65 536 addresses (/16 prefix))
  • 139.152.0.0/16 (65 536 addresses (/16 prefix))
  • 138.107.0.0/16 (65 536 addresses (/16 prefix))
  • 134.237.0.0/16 (65 536 addresses (/16 prefix))
  • 210.130.0.0/16 (65 536 addresses (/16 prefix))
  • 160.17.0.0/16 (65 536 addresses (/16 prefix))
  • 133.236.0.0/16 (65 536 addresses (/16 prefix))
  • 121.102.0.0/16 (65 536 addresses (/16 prefix))
  • 133.221.0.0/16 (65 536 addresses (/16 prefix))
  • 133.218.0.0/16 (65 536 addresses (/16 prefix))
  • 125.30.0.0/16 (65 536 addresses (/16 prefix))
  • 129.249.0.0/16 (65 536 addresses (/16 prefix))
  • 131.248.0.0/16 (65 536 addresses (/16 prefix))
  • 132.179.0.0/16 (65 536 addresses (/16 prefix))
  • 163.55.0.0/16 (65 536 addresses (/16 prefix))
  • 133.127.0.0/16 (65 536 addresses (/16 prefix))
  • 133.137.0.0/16 (65 536 addresses (/16 prefix))
  • 133.142.0.0/16 (65 536 addresses (/16 prefix))
  • 133.159.0.0/16 (65 536 addresses (/16 prefix))
  • 133.215.0.0/16 (65 536 addresses (/16 prefix))
  • 203.180.0.0/16 (65 536 addresses (/16 prefix))
  • 133.173.0.0/16 (65 536 addresses (/16 prefix))
  • 163.140.0.0/16 (65 536 addresses (/16 prefix))
  • 210.138.0.0/16 (65 536 addresses (/16 prefix))
  • 210.128.0.0/16 (65 536 addresses (/16 prefix))
  • 163.218.0.0/16 (65 536 addresses (/16 prefix))
  • 133.194.0.0/17 (32 768 addresses (/17 prefix))
  • 118.151.0.0/17 (32 768 addresses (/17 prefix))
  • 220.156.0.0/17 (32 768 addresses (/17 prefix))
  • 58.138.0.0/17 (32 768 addresses (/17 prefix))
  • 220.100.0.0/17 (32 768 addresses (/17 prefix))
  • 101.128.128.0/17 (32 768 addresses (/17 prefix))

IPv6 Prefixes (11 total)

  • 2001:240::/32
  • 2001:300::/32
  • 2001:48b0::/32
  • 2400:3980::/32
  • 240a:71:8000::/35
  • 2401:ce20:c::/47
  • 2403:5700::/47
  • 2401:ce20:e::/48