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AS4766Korea Telecom

South KoreaRegistryAPNICTypeCarrier

As of 11th November 2026, AS4766 (Korea Telecom), a transit carrier registered in South Korea with APNIC, originates 2,774 IPv4 prefixes covering 70M addresses and 65 IPv6 prefixes. By IPv4 address space that makes it the 7th-largest of the 80,763 networks we see originating IPv4, and the largest of 915 in South Korea. It is seen behind 39 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS132337 (Axclusive), and in front of 627 downstream networks. 5% of its announcements have a valid RPKI ROA; 28 are RPKI-invalid. 77% of its routes reach at least 90% of full-feed peers, and 2 prefixes are also originated by another network.

At a glance

IPv4 prefixes

2,774

IPv6 prefixes

65

IPv4 addresses

70M

IPv6 /64s

249B

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…AS132337AxclusiveAS13030Init7 (Switzerlan…AS16552Tiggee LLCAS49544i3D.net B.VAS215859Hetzner Cloud - S…AS3549Lumen (fka. Globa…AS20130Depaul UniversityAS9002RETN Limited

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

1,344

adjacent networks

Upstreams
393%
Peers
67850%
Downstreams
62747%

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

Upstreams of AS4766
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer223,32061
AS132337AxclusiveSGAdjacent68,8872
AS1299Arelion (fka. Telia Carrier)SEPeer53,26267
AS3356Lumen (Level 3)USPeer50,65438
AS2914NTT America, Inc.USPeer32,03827
AS2497Internet Initiative Japan Inc.JPPeer22,6256
AS9002RETN LimitedGBPeer21,5787
AS174Cogent Communications, LLCUSPeer20,81231
AS6830Liberty Global Europe Holding B.V.EUPeer16,1453
AS3491PCCW Global (HK) Ltd.HKPeer14,1108

Prefixes

All 2,839

The largest blocks AS4766 originates, widest first.

Largest prefixes originated by AS4766
PrefixAddressesVisibility
59.0.0.0/112.1M76/77
121.128.0.0/112.1M76/77
121.160.0.0/112.1M76/77
125.128.0.0/112.1M76/77
14.64.0.0/121M76/77
14.80.0.0/121M76/77
59.0.0.0/121M76/77
59.16.0.0/121M76/77
112.160.0.0/121M76/77
112.176.0.0/121M76/77

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

  • Valid5.1%145
  • Invalid1.0%28
  • No ROA93.9%2,666

Propagation

  • Globally propagated90% of full-feed peers or more76.9%2,183
  • Partially propagated40% to 90%<0.1%2
  • Seen by few peersUnder 40%23.0%654

Prefix sizes

IPv4 — 2,774 prefixes

IPv6 — 65 prefixes

  • /3017.2B × /649.2%6
  • /318.6B × /647.7%5
  • /324.3B × /6436.9%24
  • /441M × /6410.8%7
  • /4865.5k × /6416.9%11
  • /49 and longerAggregated18.5%12

Recent changes

Announcements that started or stopped since 12th Oct 2026.

82 announced and 12 withdrawn in all; the most recent are shown.

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