$ query “AS1237” --type=asn → 1 result(s)

AS1237 · KREONET-AS

KISTI

AS1237 belongs to KISTI and is a mid-size transit provider, registered in South Korea. The system announces a solid 297 472 IPv4 addresses, including a /16, and supports IPv6. Most of its address space is geolocated to South Korea. This AS's prefix announcements have been recently modified.

  • Top 5% — Top 5% of all autonomous systems by reach and degree

Basic Information

Country
🇰🇷 South Korea
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
June 27, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
203 / 157
IPv6 Prefixes (raw / aggregated)
1 / 1
IPv4 Addresses
297 472
Largest IPv4 Prefix
/16 (65 536 addresses)
Largest IPv6 Prefix
/32
Geolocated Countries
🇰🇷 South Korea (435 968 IPs)
Prefix Changed
June 22, 2026

Reputation

Reputation
Pristine — 0 flagged IPs

Connectivity Summary

Upstream Providers
2 upstreams providing transit
Peers
12 networks exchanging traffic without transit
Downstream Customers
32 downstreams buying transit
Unclassified
1 unclassified BGP neighbor
Degree
47 unique BGP neighbors
Reach
32 networks in customer cone

Upstream Providers (2)

Prefix Lists

IPv4 Prefixes (203 total)

  • 150.183.0.0/16 (65 536 addresses (/16 prefix))
  • 134.75.0.0/16 (65 536 addresses (/16 prefix))
  • 203.250.192.0/18 (16 384 addresses (/18 prefix))
  • 210.119.64.0/19 (8 192 addresses (/19 prefix))
  • 203.250.0.0/19 (8 192 addresses (/19 prefix))
  • 210.110.144.0/20 (4 096 addresses (/20 prefix))
  • 203.253.96.0/20 (4 096 addresses (/20 prefix))
  • 210.107.160.0/20 (4 096 addresses (/20 prefix))
  • 203.254.176.0/20 (4 096 addresses (/20 prefix))
  • 203.247.192.0/20 (4 096 addresses (/20 prefix))
  • 210.119.48.0/20 (4 096 addresses (/20 prefix))
  • 210.125.32.0/20 (4 096 addresses (/20 prefix))
  • 203.230.64.0/20 (4 096 addresses (/20 prefix))
  • 203.250.176.0/21 (2 048 addresses (/21 prefix))
  • 203.250.160.0/21 (2 048 addresses (/21 prefix))
  • 203.250.96.0/21 (2 048 addresses (/21 prefix))
  • 210.125.64.0/21 (2 048 addresses (/21 prefix))
  • 210.125.56.0/21 (2 048 addresses (/21 prefix))
  • 203.250.112.0/21 (2 048 addresses (/21 prefix))
  • 210.218.208.0/21 (2 048 addresses (/21 prefix))
  • 210.98.48.0/21 (2 048 addresses (/21 prefix))
  • 203.241.40.0/21 (2 048 addresses (/21 prefix))
  • 203.230.24.0/21 (2 048 addresses (/21 prefix))
  • 210.119.40.0/21 (2 048 addresses (/21 prefix))
  • 210.110.224.0/21 (2 048 addresses (/21 prefix))
  • 210.107.152.0/21 (2 048 addresses (/21 prefix))
  • 210.117.240.0/21 (2 048 addresses (/21 prefix))
  • 210.219.56.0/21 (2 048 addresses (/21 prefix))
  • 203.253.136.0/21 (2 048 addresses (/21 prefix))
  • 210.110.128.0/21 (2 048 addresses (/21 prefix))
  • 147.47.120.0/21 (2 048 addresses (/21 prefix))
  • 203.230.60.0/22 (1 024 addresses (/22 prefix))
  • 203.247.160.0/22 (1 024 addresses (/22 prefix))
  • 210.110.192.0/22 (1 024 addresses (/22 prefix))
  • 210.110.236.0/22 (1 024 addresses (/22 prefix))
  • 210.117.208.0/22 (1 024 addresses (/22 prefix))
  • 203.247.172.0/22 (1 024 addresses (/22 prefix))
  • 203.247.176.0/22 (1 024 addresses (/22 prefix))
  • 210.107.248.0/22 (1 024 addresses (/22 prefix))
  • 210.117.216.0/22 (1 024 addresses (/22 prefix))
  • 210.117.224.0/22 (1 024 addresses (/22 prefix))
  • 210.117.248.0/22 (1 024 addresses (/22 prefix))
  • 210.98.60.0/22 (1 024 addresses (/22 prefix))
  • 203.241.120.0/22 (1 024 addresses (/22 prefix))
  • 203.247.216.0/22 (1 024 addresses (/22 prefix))
  • 210.119.96.0/22 (1 024 addresses (/22 prefix))
  • 203.230.108.0/22 (1 024 addresses (/22 prefix))
  • 210.218.204.0/22 (1 024 addresses (/22 prefix))
  • 203.230.8.0/22 (1 024 addresses (/22 prefix))
  • 203.250.156.0/22 (1 024 addresses (/22 prefix))

IPv6 Prefixes (1 total)

  • 2001:320::/32