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AS5400 — British Telecommunications PLC

ASN
AS5400
Country
United Kingdom
Total Prefixes
225
Reputation
50/100

Network Information

AS Number
5400
Organization
British Telecommunications PLC
Network Type
unknown
Registry (RIR)
RIPE NCC (Europe / Middle East)
IPv4 Prefixes
55
IPv6 Prefixes
170
Peer Count
0

Contact & Metadata

Country
United Kingdom (GB)
Reputation
50/100
Last Updated
February 14, 2026

Announced Prefixes (sample)

PrefixCountryCity
::1f5f:0/117United Kingdom—
::1f5f:1000/116United Kingdom—
::1f5f:3000/117United Kingdom—
::1f5f:6000/115United Kingdom—
::1f5f:da00/119United Kingdom—
::2ef8:800/118Netherlands—
::3e05:0/113United Kingdom—
::3e66:0/113United Kingdom—
::3e86:0/112GermanyBrunsbüttel
::3eac:0/117United Kingdom—
::3ead:c000/114United Kingdom—
::3eb4:0/112GermanyMunich
::50ff:a000/116LU—
::528a:a000/115Finland—
::5296:0/115Ireland—
::84f4:4000/116United Kingdom—
::84f4:f000/120United Kingdom—
::88ee:5400/119United States—
::88ee:e000/120United States—
::a631:8000/113SwitzerlandZurich
::b95e:0/118United Kingdom—
::b9f9:400/120Netherlands—
::c06d:3400/120Germany—
::c1ca:1a00/120Germany—
::c221:3500/120United Kingdom—
::c221:3600/119United Kingdom—
::c232:a000/120GermanyFrankfurt am Main
::c24a:5000/117United Kingdom—
::c24c:2800/120Germany—
::c26b:7200/120France—
::c2d5:4000/115United Kingdom—
::c324:5200/120Germany—
::c33c:b600/119SwedenHanden
::c342:4600/120Germany—
::c35a:4000/115PolandWarsaw
::c363:4000/116United Kingdom—
::c364:0/112NetherlandsDuivendrecht
::c3a3:0/112FranceMennecy
::c3ab:2400/118United Kingdom—
::c3b6:6000/115United Kingdom—
::c6b2:ec00/120United States—
::cb9e:4c00/119India—
::cc34:bc00/120United States—
::ce49:0/112United States—
::d408:a000/115United Kingdom—
::d415:c000/115United Kingdom—
::d41f:c000/115United Kingdom—
::d429:8000/115United Kingdom—
::d46c:0/115NetherlandsSleeuwijk
::d47f:0/115United Kingdom—
::d4a2:c000/114United KingdomHeanor
::d50f:0/112GermanyDüsseldorf
::d589:a000/115SwitzerlandZurich
::d5c2:0/114NetherlandsRotterdam
::d5ec:4000/114United Kingdom—
31.95.0.0/21United Kingdom—
31.95.16.0/20United Kingdom—
31.95.48.0/21United Kingdom—
31.95.96.0/19United Kingdom—
31.95.218.0/23United Kingdom—
2001:0:1f5f::/53United Kingdom—
2001:0:1f5f:1000::/52United Kingdom—
2001:0:1f5f:3000::/53United Kingdom—
2001:0:1f5f:6000::/51United Kingdom—
2001:0:1f5f:da00::/55United Kingdom—
2001:0:2ef8:800::/54Netherlands—
2001:0:3e05::/49United Kingdom—
2001:0:3e66::/49United Kingdom—
2001:0:3e86::/48GermanyBrunsbüttel
2001:0:3eac::/53United Kingdom—
2001:0:3ead:c000::/50United Kingdom—
2001:0:3eb4::/48GermanyMunich
2001:0:50ff:a000::/52LU—
2001:0:528a:a000::/51Finland—
2001:0:5296::/51Ireland—
2001:0:84f4:4000::/52United Kingdom—
2001:0:84f4:f000::/56United Kingdom—
2001:0:88ee:5400::/55United States—
2001:0:88ee:e000::/56United States—
2001:0:a631:8000::/49SwitzerlandZurich
2001:0:b95e::/54United Kingdom—
2001:0:b9f9:400::/56Netherlands—
2001:0:c06d:3400::/56Germany—
2001:0:c1ca:1a00::/56Germany—
2001:0:c221:3500::/56United Kingdom—
2001:0:c221:3600::/55United Kingdom—
2001:0:c232:a000::/56GermanyFrankfurt am Main
2001:0:c24a:5000::/53United Kingdom—
2001:0:c24c:2800::/56Germany—
2001:0:c26b:7200::/56France—
2001:0:c2d5:4000::/51United Kingdom—
2001:0:c324:5200::/56Germany—
2001:0:c33c:b600::/55SwedenHanden
2001:0:c342:4600::/56Germany—
2001:0:c35a:4000::/51PolandWarsaw
2001:0:c363:4000::/52United Kingdom—
2001:0:c364::/48NetherlandsDuivendrecht
2001:0:c3a3::/48FranceMennecy
2001:0:c3ab:2400::/54United Kingdom—
2001:0:c3b6:6000::/51United Kingdom—

Showing first 100 prefixes. AS5400 announces 225 total.

About AS5400

AS5400 (British Telecommunications PLC) is an unknown network registered under RIPE NCC (Europe / Middle East) and headquartered in United Kingdom.

The network announces 55 IPv4 and 170 IPv6 prefixes, maintains peering relationships with 0 other autonomous systems, and has a reputation score of 50/100.