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AS21433Accenture UK Limited

United KingdomRegistryRIPE NCC

As of 14th November 2026, AS21433 (Accenture UK Limited), a network registered in the United Kingdom with RIPE NCC, originates 328 IPv4 prefixes covering 106k addresses and 64 IPv6 prefixes. By IPv4 address space that makes it the 2,353rd-largest of the 80,840 networks we see originating IPv4, and the 55th-largest of 2,124 in the United Kingdom. It is seen behind 79 upstream networks, most often AS9498 (Bharti Airtel Ltd.) and AS4755 (TATA Communications (formerly VSNL)), and in front of 1 downstream network. 56% of its announcements have a valid RPKI ROA; 1 is RPKI-invalid. 97% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

328

IPv6 prefixes

64

IPv4 addresses

106k

IPv6 /64s

7.1M

Upstream graph

The networks AS21433 is seen behind, one and two hops out, drawn from real AS paths.

AS21433Toward the internet core
Upstream graph for AS21433: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS21433Accenture UK Limi…This networkAS2516KDDI CorporationAS4713NTT Communication…AS4755TATA Communicatio…AS8220COLTAS9498Bharti Airtel Ltd.AS2914NTT America, Inc.AS1299Arelion (fka. Tel…AS3356Lumen (Level 3)AS6453TATA Communicatio…AS35280F5 Networks SARLAS3491PCCW Global (HK) …AS6939Hurricane Electri…

Networks observed one and two hops upstream of AS21433 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

165

adjacent networks

Upstreams
7948%
Peers
8552%
Downstreams
11%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 79.

Upstreams of AS21433
NetworkCountryRelationshipPathsVantage pts
AS9498Bharti Airtel Ltd.INPeer4,68478
AS4755TATA Communications (formerly VSNL)INPeer3,632141
AS8220COLTGBPeer1,970141
AS2516KDDI CorporationJPPeer1,195138
AS4713NTT Communications Corporation (OCN)JPPeer1,000141
AS12874Fastweb SpAITPeer960141
AS3356Lumen (Level 3)USPeer956141
AS55410Vodafone Idea LtdINPeer823142
AS9658Eastern Telecommunications Philippines, Inc.PHPeer75478
AS4775Globe TelecomsPHPeer69678

Prefixes

All 392

The largest blocks AS21433 originates, widest first.

Largest prefixes originated by AS21433
PrefixAddressesVisibility
170.251.120.0/212k78/78
170.251.72.0/221k78/78
170.251.100.0/221k78/78
170.251.188.0/221k78/78
144.36.26.0/2351278/78
144.36.32.0/2351278/78
144.36.70.0/2351278/78
144.36.118.0/2351278/78
144.36.120.0/2351278/78
144.36.130.0/2351278/78

Routing health

How AS21433'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

  • Valid55.9%219
  • Invalid0.3%1
  • No ROA43.9%172

Propagation

  • Globally propagated90% of full-feed peers or more97.4%382
  • Partially propagated40% to 90%0.5%2
  • Seen by few peersUnder 40%2.0%8

Prefix sizes

IPv4 — 328 prefixes

IPv6 — 64 prefixes

  • /47131k × /6470.3%45
  • /4865.5k × /6429.7%19

Recent changes

Announcements that started or stopped since 15th Oct 2026.

21 announced and 16 withdrawn in all; the most recent are shown.

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