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AS4766Korea Telecom

South KoreaRegistryAPNICTypeCarrier

As of 26th September 2026, AS4766 (Korea Telecom), a transit carrier registered in South Korea with APNIC, originates 2,719 IPv4 prefixes covering 70M addresses and 59 IPv6 prefixes. By IPv4 address space that makes it the 7th-largest of the 79,480 networks we see originating IPv4, and the largest of 908 in South Korea. It is seen behind 39 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS132337 (Axclusive), and in front of 613 downstream networks. 5% of its announcements have a valid RPKI ROA; 6 are RPKI-invalid. 78% of its routes reach at least 90% of full-feed peers, and 3 prefixes are also originated by another network.

At a glance

IPv4 prefixes

2,719

IPv6 prefixes

59

IPv4 addresses

70M

IPv6 /64s

193B

Upstream graph

The networks AS4766 is seen behind, one and two hops out, drawn from real AS paths.

AS4766Toward the internet core
Upstream graph for AS4766: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS4766Korea TelecomThis networkAS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS3356Lumen (Level 3)AS6939Hurricane Electri…AS132337AxclusiveAS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS3130RGnet OUAS49544i3D.net B.VAS3549Lumen (fka. Globa…AS18106Viewqwest Pte LtdAS20130Depaul University

Networks observed one and two hops upstream of AS4766 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

1,343

adjacent networks

Upstreams
393%
Peers
69151%
Downstreams
61346%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS4766
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer264,43566
AS132337AxclusiveSGPeer68,6712
AS1299Arelion (fka. Telia Carrier)SEPeer54,81062
AS2914NTT America, Inc.USPeer30,80628
AS3356Lumen (Level 3)USPeer28,42137
AS9002RETN LimitedGBPeer25,14014
AS3257GTT Communications Inc.USPeer23,34129
AS174Cogent Communications, LLCUSPeer23,15532
AS2497Internet Initiative Japan Inc.JPPeer22,4506
AS3491PCCW Global (HK) Ltd.HKPeer13,9608

Prefixes

All 2,778

The largest blocks AS4766 originates, widest first.

Largest prefixes originated by AS4766
PrefixAddressesVisibility
59.0.0.0/112.1M80/81
121.128.0.0/112.1M80/81
121.160.0.0/112.1M80/81
125.128.0.0/112.1M80/81
14.64.0.0/121M80/81
14.80.0.0/121M80/81
59.0.0.0/121M80/81
59.16.0.0/121M80/81
112.160.0.0/121M80/81
112.176.0.0/121M80/81

Routing health

How AS4766's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid5.0%139
  • Invalid0.2%6
  • No ROA94.8%2,633

Propagation

  • Globally propagated90% of full-feed peers or more77.9%2,163
  • Partially propagated40% to 90%<0.1%1
  • Seen by few peersUnder 40%22.1%614

Prefix sizes

IPv4 — 2,719 prefixes

IPv6 — 59 prefixes

  • /3017.2B × /646.8%4
  • /318.6B × /646.8%4
  • /324.3B × /6435.6%21
  • /441M × /6411.9%7
  • /4865.5k × /6418.6%11
  • /49 and longerAggregated20.3%12

Recent changes

Announcements that started or stopped since 27th Aug 2026.

30 announced and 23 withdrawn in all; the most recent are shown.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.