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AS21433Accenture UK Limited

United KingdomRegistryRIPE NCC

As of 27th September 2026, AS21433 (Accenture UK Limited), a network registered in the United Kingdom with RIPE NCC, originates 321 IPv4 prefixes covering 103k addresses and 64 IPv6 prefixes. By IPv4 address space that makes it the 2,334th-largest of the 79,525 networks we see originating IPv4, and the 51st-largest of 2,074 in the United Kingdom. It is seen behind 77 upstream networks, most often AS9498 (Bharti Airtel Ltd.) and AS4755 (TATA Communications (formerly VSNL)), and in front of 1 downstream network. 48% of its announcements have a valid RPKI ROA; 5 are RPKI-invalid. 98% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

321

IPv6 prefixes

64

IPv4 addresses

103k

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.AS1299Arelion (fka. Tel…AS3356Lumen (Level 3)AS6453TATA Communicatio…AS35280F5 Networks SARLAS15576NTS workspace AGAS3491PCCW 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

159

adjacent networks

Upstreams
7748%
Peers
8151%
Downstreams
11%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 77.

Upstreams of AS21433
NetworkCountryRelationshipPathsVantage pts
AS9498Bharti Airtel Ltd.INPeer4,83981
AS4755TATA Communications (formerly VSNL)INPeer3,789145
AS8220COLTGBPeer2,023144
AS2516KDDI CorporationJPPeer1,250141
AS4713NTT Communications Corporation (OCN)JPPeer1,007145
AS3356Lumen (Level 3)USPeer986145
AS12874Fastweb SpAITPeer961145
AS55410Vodafone Idea LtdINPeer813145
AS4775Globe TelecomsPHPeer80081
AS9583Sify LimitedINPeer689145

Prefixes

All 385

The largest blocks AS21433 originates, widest first.

Largest prefixes originated by AS21433
PrefixAddressesVisibility
170.251.120.0/212k81/81
170.251.72.0/221k81/81
170.251.100.0/221k81/81
170.251.188.0/221k81/81
144.36.32.0/2351280/81
144.36.70.0/2351280/81
144.36.118.0/2351281/81
144.36.120.0/2351281/81
144.36.130.0/2351281/81
144.36.134.0/2351281/81

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

  • Valid47.5%183
  • Invalid1.3%5
  • No ROA51.2%197

Propagation

  • Globally propagated90% of full-feed peers or more97.7%376
  • Partially propagated40% to 90%0.3%1
  • Seen by few peersUnder 40%2.1%8

Prefix sizes

IPv4 — 321 prefixes

IPv6 — 64 prefixes

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

Recent changes

Announcements that started or stopped since 28th Aug 2026.

  • Withdrawn144.36.26.0/2325th Sept 2026
  • Withdrawn144.36.27.0/2425th Sept 2026
  • Withdrawn170.251.36.0/2325th Sept 2026
  • Announced170.248.191.0/2422nd Sept 2026
  • Announced170.252.176.0/2422nd Sept 2026
  • Withdrawn170.248.16.0/2321st Sept 2026
  • Withdrawn170.248.16.0/2421st Sept 2026
  • Withdrawn170.248.17.0/2421st Sept 2026
  • Withdrawn170.251.77.0/2421st Sept 2026
  • Withdrawn2404:3d00:413e::/4721st Sept 2026
  • Withdrawn2404:3d00:413e::/4821st Sept 2026
  • Withdrawn2610:b0:401c::/4721st Sept 2026

2 announced and 40 withdrawn in all; the most recent are shown.

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