$ query “AS4766” --type=asn → 1 result(s)

AS4766 · PACIFIC-FORTUNE-BLAH

Korea Telecom

AS4766 is operated by Korea Telecom and serves as a major transit provider, based in South Korea since 2017. The system announces a whopping 47.2 million IPv4 addresses (1.27% of routable IPv4 space), including a /10, and supports IPv6. Most of its address space is geolocated to South Korea, with additional presence in the United States and the United Kingdom, and smaller footprints in 13 additional countries. Prefix announcements for this AS were recently updated.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • Space Overlord — Over 10 million IPv4 addresses
  • #78 by Reach — Top 100 by customer cone size
  • #1 in South Korea — Top 10 by reach within country

Basic Information

Country
🇰🇷 South Korea
Category
Internet Service Provider
Network Role
Major Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
December 01, 2017
Last Changed
May 10, 2026
Last Seen
June 22, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
2 132 / 677
IPv6 Prefixes (raw / aggregated)
33 / 20
IPv4 Addresses
47 201 792
Largest IPv4 Prefix
/10 (4 194 304 addresses)
Largest IPv6 Prefix
/29
Geolocated Countries
🇰🇷 South Korea (88 449 024 IPs), 🇺🇸 United States (22 272 IPs), 🇬🇧 United Kingdom (6 144 IPs) and 13 more
Prefix Changed
June 23, 2026

Reputation

Reputation
Fair — 1 095 flagged IPs out of 47 201 792 total (0.00%)
Open Proxies
18 known open proxies in this network

Connectivity Summary

Upstream Providers
5 upstreams providing transit
Peers
95 networks exchanging traffic without transit
Downstream Customers
560 downstreams buying transit
Unclassified
4 unclassified BGP neighbors
Degree
664 unique BGP neighbors
Reach
34 927 networks in customer cone

Upstream Providers (5)

  • AS6939 — HURRICANE
  • AS174 — COGENT (Tier-1 transit)
  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS1299 — TWELVE99 (Tier-1 transit)
  • AS701 — UUNET (Tier-1 transit)

Prefix Lists

IPv4 Prefixes (2 132 total)

  • 121.128.0.0/10 (4 194 304 addresses (/10 prefix))
  • 175.192.0.0/10 (4 194 304 addresses (/10 prefix))
  • 119.192.0.0/11 (2 097 152 addresses (/11 prefix))
  • 14.64.0.0/11 (2 097 152 addresses (/11 prefix))
  • 112.160.0.0/11 (2 097 152 addresses (/11 prefix))
  • 59.0.0.0/11 (2 097 152 addresses (/11 prefix))
  • 183.96.0.0/11 (2 097 152 addresses (/11 prefix))
  • 125.128.0.0/11 (2 097 152 addresses (/11 prefix))
  • 118.32.0.0/11 (2 097 152 addresses (/11 prefix))
  • 14.32.0.0/11 (2 097 152 addresses (/11 prefix))
  • 39.16.0.0/12 (1 048 576 addresses (/12 prefix))
  • 115.0.0.0/12 (1 048 576 addresses (/12 prefix))
  • 49.16.0.0/12 (1 048 576 addresses (/12 prefix))
  • 220.80.0.0/12 (1 048 576 addresses (/12 prefix))
  • 1.96.0.0/12 (1 048 576 addresses (/12 prefix))
  • 221.144.0.0/12 (1 048 576 addresses (/12 prefix))
  • 218.144.0.0/12 (1 048 576 addresses (/12 prefix))
  • 222.96.0.0/12 (1 048 576 addresses (/12 prefix))
  • 169.208.0.0/12 (1 048 576 addresses (/12 prefix))
  • 211.192.0.0/13 (524 288 addresses (/13 prefix))
  • 220.120.0.0/13 (524 288 addresses (/13 prefix))
  • 49.56.0.0/13 (524 288 addresses (/13 prefix))
  • 222.112.0.0/13 (524 288 addresses (/13 prefix))
  • 221.160.0.0/13 (524 288 addresses (/13 prefix))
  • 27.232.0.0/13 (524 288 addresses (/13 prefix))
  • 211.216.0.0/13 (524 288 addresses (/13 prefix))
  • 61.72.0.0/13 (524 288 addresses (/13 prefix))
  • 211.224.0.0/13 (524 288 addresses (/13 prefix))
  • 115.16.0.0/13 (524 288 addresses (/13 prefix))
  • 220.72.0.0/13 (524 288 addresses (/13 prefix))
  • 110.68.0.0/14 (262 144 addresses (/14 prefix))
  • 39.4.0.0/14 (262 144 addresses (/14 prefix))
  • 61.80.0.0/14 (262 144 addresses (/14 prefix))
  • 220.116.0.0/14 (262 144 addresses (/14 prefix))
  • 211.104.0.0/14 (262 144 addresses (/14 prefix))
  • 210.90.0.0/15 (131 072 addresses (/15 prefix))
  • 61.84.0.0/15 (131 072 addresses (/15 prefix))
  • 210.222.0.0/15 (131 072 addresses (/15 prefix))
  • 211.252.0.0/15 (131 072 addresses (/15 prefix))
  • 118.234.0.0/15 (131 072 addresses (/15 prefix))
  • 222.120.0.0/15 (131 072 addresses (/15 prefix))
  • 210.104.0.0/15 (131 072 addresses (/15 prefix))
  • 220.70.0.0/15 (131 072 addresses (/15 prefix))
  • 211.250.0.0/15 (131 072 addresses (/15 prefix))
  • 211.54.0.0/15 (131 072 addresses (/15 prefix))
  • 210.178.0.0/15 (131 072 addresses (/15 prefix))
  • 116.200.0.0/15 (131 072 addresses (/15 prefix))
  • 211.184.0.0/15 (131 072 addresses (/15 prefix))
  • 163.222.0.0/16 (65 536 addresses (/16 prefix))
  • 211.34.0.0/16 (65 536 addresses (/16 prefix))

IPv6 Prefixes (33 total)

  • 2400:140::/29
  • 2400:130::/30
  • 2400:f4::/30
  • 2400:f2::/31
  • 2400:148::/32
  • 2400:e1::/32
  • 2400:e2::/32
  • 2400:f1::/32
  • 2400:156::/32
  • 2400:134::/32
  • 2400:0:840::/42
  • 2400:0:820::/43
  • 2400:0:810::/44
  • 2400:103:c009::/48
  • 2400:32::/48
  • 2400:0:611::/48
  • 2400:150:c009::/48
  • 2400:12::/48
  • 2400:160:c009::/48
  • 2400:221:3002::/48