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

AS4766 · KIXS-AS

Korea Telecom

AS4766 is operated by Korea Telecom and serves as a major transit provider, registered in South Korea. The system announces a whopping 47.2 million IPv4 addresses (1.27% of routable IPv4 space), including a /10, and supports IPv6. The bulk of its IP address space is in South Korea, with additional presence in the United States and Lithuania, and smaller footprints in 15 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
  • #62 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.)
Last Changed
March 04, 2026
Last Seen
April 19, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
2 130 / 666
IPv6 Prefixes (raw / aggregated)
32 / 19
IPv4 Addresses
47 199 232
Largest IPv4 Prefix
/10 (4 194 304 addresses)
Largest IPv6 Prefix
/29
Geolocated Countries
🇰🇷 South Korea (88 454 400 IPs), 🇺🇸 United States (16 640 IPs), 🇱🇹 Lithuania (4 096 IPs) and 15 more
Prefix Changed
April 20, 2026

Reputation

Reputation
Good — 958 flagged IPs out of 47 199 232 total (0.00%)
Open Proxies
26 known open proxies in this network

Connectivity Summary

Upstream Providers
8 upstreams providing transit
Peers
96 networks exchanging traffic without transit
Downstream Customers
557 downstreams buying transit
Unclassified
5 unclassified BGP neighbors
Degree
666 unique BGP neighbors
Reach
40 345 networks in customer cone

Upstream Providers (8)

  • AS6939 — HURRICANE
  • AS174 — COGENT-174 (Tier-1 transit)
  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS1299 — TWELVE99 (Tier-1 transit)
  • AS3549 — LVLT-3549
  • AS2914 — NTT-DATA-2914 (Tier-1 transit)
  • AS701 — UUNET (Tier-1 transit)
  • AS983 — AKARI-NETWORKS

Prefix Lists

IPv4 Prefixes (2 130 total)

  • 121.128.0.0/10 (4 194 304 addresses (/10 prefix))
  • 175.192.0.0/10 (4 194 304 addresses (/10 prefix))
  • 14.64.0.0/11 (2 097 152 addresses (/11 prefix))
  • 14.32.0.0/11 (2 097 152 addresses (/11 prefix))
  • 59.0.0.0/11 (2 097 152 addresses (/11 prefix))
  • 119.192.0.0/11 (2 097 152 addresses (/11 prefix))
  • 183.96.0.0/11 (2 097 152 addresses (/11 prefix))
  • 118.32.0.0/11 (2 097 152 addresses (/11 prefix))
  • 125.128.0.0/11 (2 097 152 addresses (/11 prefix))
  • 112.160.0.0/11 (2 097 152 addresses (/11 prefix))
  • 221.144.0.0/12 (1 048 576 addresses (/12 prefix))
  • 220.80.0.0/12 (1 048 576 addresses (/12 prefix))
  • 39.16.0.0/12 (1 048 576 addresses (/12 prefix))
  • 169.208.0.0/12 (1 048 576 addresses (/12 prefix))
  • 115.0.0.0/12 (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))
  • 1.96.0.0/12 (1 048 576 addresses (/12 prefix))
  • 49.16.0.0/12 (1 048 576 addresses (/12 prefix))
  • 61.72.0.0/13 (524 288 addresses (/13 prefix))
  • 27.232.0.0/13 (524 288 addresses (/13 prefix))
  • 211.192.0.0/13 (524 288 addresses (/13 prefix))
  • 49.56.0.0/13 (524 288 addresses (/13 prefix))
  • 220.72.0.0/13 (524 288 addresses (/13 prefix))
  • 220.120.0.0/13 (524 288 addresses (/13 prefix))
  • 115.16.0.0/13 (524 288 addresses (/13 prefix))
  • 221.160.0.0/13 (524 288 addresses (/13 prefix))
  • 211.216.0.0/13 (524 288 addresses (/13 prefix))
  • 222.112.0.0/13 (524 288 addresses (/13 prefix))
  • 211.224.0.0/13 (524 288 addresses (/13 prefix))
  • 110.68.0.0/14 (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))
  • 61.80.0.0/14 (262 144 addresses (/14 prefix))
  • 39.4.0.0/14 (262 144 addresses (/14 prefix))
  • 116.200.0.0/15 (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))
  • 210.178.0.0/15 (131 072 addresses (/15 prefix))
  • 118.234.0.0/15 (131 072 addresses (/15 prefix))
  • 211.54.0.0/15 (131 072 addresses (/15 prefix))
  • 210.104.0.0/15 (131 072 addresses (/15 prefix))
  • 222.120.0.0/15 (131 072 addresses (/15 prefix))
  • 220.70.0.0/15 (131 072 addresses (/15 prefix))
  • 211.252.0.0/15 (131 072 addresses (/15 prefix))
  • 211.250.0.0/15 (131 072 addresses (/15 prefix))
  • 211.184.0.0/15 (131 072 addresses (/15 prefix))
  • 210.90.0.0/15 (131 072 addresses (/15 prefix))
  • 203.234.0.0/16 (65 536 addresses (/16 prefix))
  • 163.222.0.0/16 (65 536 addresses (/16 prefix))
  • and 616 more

IPv6 Prefixes (32 total)

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