AS2856 British Telecommunications Limited

AS2856British Telecommunications LimitedFAI

WHOIS Topology

United Kingdom · RIPE NCCbt.com

Hosts top sitesHome broadbandTor relays

IPv4 addresses

13 947 136

545 announced prefixes

IPv6 addresses

1.07 × 10³¹

7 announced prefixes

BGP neighbours

…

CAIDA rank

#330

Customer cone 157 ASNs

Estimated users

17,4 M

APNIC: 17,4 M

RPKI

71% valid

3 invalid · 157 not covered

Average purity

4 694 sampled IPs

IXPs / facilities

2 / 3

Operator self-reported

History

How prefixes were announced and changed hands, registration changes, and outage or hijack incidents.

Loading routing history…

IP ranges

Currently announced prefixes with their RIR registration and geolocation.

Prefix	RPKI	Registration	Geolocation	Addresses
86.128.0.0/10	Valid	UK-BT-20050207RIPE	Deptford	4 194 304
81.128.0.0/11	Valid	UK-BT-20020725RIPE	City of Westminster	2 097 152
86.128.0.0/11	Valid	BT-INFRARIPE	Deptford	2 097 152
81.128.0.0/12	Valid	BT-INFRARIPE	City of Westminster	1 048 576
86.128.0.0/12	Valid	BT-INFRARIPE	Deptford	1 048 576
109.144.0.0/12	Valid	UK-BT-20090806RIPE	United Kingdom	1 048 576
217.32.0.0/12	Valid	UK-BT-20000920RIPE	United Kingdom	1 048 576
31.48.0.0/13	Valid	UK-BT-20101231RIPE	Crawley	524 288
95.144.0.0/13	Valid	UK-TM-20090119RIPE	Haverfordwest	524 288
31.100.0.0/14	Valid	UK-TM-20101125RIPE	United Kingdom	262 144
31.112.0.0/14	Valid	UK-TM-20101125RIPE	Putney	262 144
31.116.0.0/14	Valid	UK-TM-20101125RIPE	United Kingdom	262 144
147.148.0.0/14	Valid	BTRIPE	Darwen	262 144
194.72.0.0/14	Valid	UK-BT-961016RIPE	Newport Pagnell	262 144
213.120.0.0/14	Valid	UK-BT-20000403RIPE	Coventry	262 144
5.80.0.0/15	Valid	UK-BT-20120613RIPE	Gloucester	131 072
31.90.0.0/15	Valid	EEMobileRIPE	United Kingdom	131 072
31.92.0.0/15	Valid	EEMobileRIPE	Royal Tunbridge Wells	131 072
31.106.0.0/15	Valid	UK-TM-20101125RIPE	United Kingdom	131 072
31.122.0.0/15	Valid	UK-TM-20101125RIPE	United Kingdom	131 072

Only the first 500 prefixes are listed; address counts and geography use all prefixes.

/24 block profile

One square per /24: colour shows the risk type, shade how many addresses are flagged, stripes mark datacenter blocks. Click a square to see all 256 addresses.

/24s with data 2 396 / 54 481 （4%） · flagged 182

No risk flagsDatacenter (no flags)ProxyVPNAbuse / blocklistTorDarker = more flagged addresses; dashed = block screen only

86.128.0.0/101152/16384 with data · 51 flagged

81.128.0.0/11308/8192 with data · 27 flagged

109.144.0.0/12260/4096 with data · 16 flagged

31.48.0.0/13118/2048 with data · 8 flagged

217.32.0.0/1280/4096 with data · 8 flagged

95.144.0.0/1377/2048 with data · 2 flagged

31.94.0.0/1653/256 with data · 12 flagged

31.126.0.0/1535/512 with data · 1 flagged

109.180.0.0/1533/512 with data · 7 flagged

5.80.0.0/1532/512 with data · 2 flagged

213.120.0.0/1423/1024 with data · 4 flagged

165.120.0.0/1622/256 with data · 3 flagged

Hover a square for its numbers; click to see all 256 addresses.

Each prefix shows its 64 /24s with the most data. Built daily from lookups, neighbour sampling, public lists and block screening.

IP reputation

IPs from this network that CleanIP has analysed: purity, abuse reports and the riskiest /24 blocks.

Purity distribution

85–100 3 04870–84 1 54650–69 970–49 3

0.03%

Share of IPv4 reported or blocklisted

3 576

Listed IPs

4 694

Analysed IPs

Riskiest /24 blocks

/24 block	Flagged	Analysed
31.94.16.0/24	3	44
31.94.6.0/24	2	56
151.245.206.0/24	2	2
31.94.37.0/24	1	41
31.94.66.0/24	1	19
31.94.30.0/24	1	16
31.94.28.0/24	1	12
151.245.204.0/24	1	3
109.157.226.0/24	1	1
151.245.205.0/24	1	1

Flagged = VPN, proxy, Tor or purity below 50. Samples come from user lookups and neighbour sampling, not every address in this network.

Geography

Where this network’s IPv4 addresses are located.

United Kingdom100.0%
Germany0.0%
United States0.0%
Lithuania0.0%
Greece0.0%

Scope: Single country
In registered country: 100.0%

Estimated by sampling IPv4 ranges against a geolocation database.

Observation du trafic

AS2856 · 7 derniers jours

Mobile vs ordinateur

Ordinateur47.1%Mobile52.8%

Robot vs humain

Humain86.0%Robot14.0%

Adoption et usage

Adoption et usage des principaux protocoles

Version du protocole Internet (IP)

IPv433.5%IPv666.5%

Version HTTP

HTTP/1.x

12.6%HTTP/2

60.1%HTTP/3

27.3%

HTTP vs HTTPS

98.5% HTTPS (chiffré)

HTTP en clair 1.5%

Version TLS

TLS 1.0/1.1< 0.1%TLS 1.25.9%TLS 1.366.4%QUIC27.8%

Sécurité et attaques

Aperçu du trafic d'attaque sur les couches réseau et application

Attaques de couche 7

GET

85.7%POST

10.9%HEAD

1.9%OPTIONS

1.0%PATCH

0.5%Autre

< 0.1%

Annonces BGP

Annonces de routes BGP par heure sur les 7 derniers jours

2 104 742

Total sur 7 jours

149 945

Pic horaire

Données : Cloudflare Radar, sous licence CC BY-NC 4.0

Activity

Hourly traffic over the last 7 days, normalized to this network’s peak.

A pronounced day/night rhythm, typical of networks with human users.

	00						06						12						18
Mon
Tue
Wed
Thu
Fri
Sat
Sun

Times in UTCLessMore

Peak hour: 19:00–20:00
Active hours: 18 hrs
Weekend vs weekday: Weekdays ≈ weekends
Busiest day: Wed

Chargement…

Opérateurs amont et voisins BGP

AS2856Page dédiée

Chargement des opérateurs amont et des voisins…

WHOIS record

The registry’s record for this AS number: holder, status, dates and contacts.

Sources

Where the information on this page comes from and when it was updated.

Information	Source	Updated
Registered country	RIR daily delegation statistics	2026-10-22
Registered address & allocation date	RIR registration data (RDAP)	2026-09-26
Organization & company country	AS-to-organization data	2026-10-22
Network type	CleanIP ASN canon	2026-10-22
Exchanges & facilities	Operator self-reported interconnection data	2026-10-22
Announced prefixes & BGP neighbours	Public BGP routing data	2026-10-23
IPv4 geography	Geolocation database	—
RPKI validation	RPKI ROA validation data	2026-10-23
Rank & customer cone	CAIDA AS Rank	2026-10-01
Estimated users (APNIC)	APNIC Labs user estimates	2026-10-20
Network tags	Public routing data community tags	2026-10-23
IP reputation	CleanIP lookups and neighbour sampling	—

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Recoupement multisource · Données de réputation internes · Uniquement des données réelles