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Network · ASN lookup

AS2856: BT

AS2856 belongs to BT and is registered in the United Kingdom.

Facts about AS2856

Dataset read 2026-11-01 What the public iptoasn.com dataset held for AS2856 on the day this copy was read. It is refreshed about once a month. IPv4 only

AS number

AS2856

Registered descriptionBT-UK-AS BTnet UK Regional network

GBUnited Kingdom
IPv4 addresses The addresses in all 423 of its ranges. The share is that total over the 4,294,967,296 addresses of the whole IPv4 space.
13,859,584
0.32% of the whole IPv4 space
IPv4 ranges
423
Kind of network
Home and business broadband
Hosting network Yes only when the AS number is on our list of hosting and cloud networks. Not on our list says nothing about what kind of network it is.
Not on our list

The 15 largest ranges below hold 84.3% of its addresses Each segment is one of the ranges listed below, drawn at its share of all 13,859,584 addresses of AS2856. The empty part is every other range. 11,682,816 of 13,859,584

Country: United Kingdom (GB), as the registry holds it. Where the network is registered, which is not always where its customers are. Open AS2856 in the ASN lookup

Largest IPv4 ranges of AS2856

Each bar is the range's address count against the largest one. A prefix such as /12 shows when a range is exactly one aligned CIDR block.

The 15 largest of 423, biggest first

Largest IPv4 ranges of AS2856, with the number of addresses in each
#First address to last addressSize against the largest rangeAddresses
0186.128.0.0 to 86.191.255.255/104,194,304
0281.128.0.0 to 81.159.255.255/112,097,152
03109.144.0.0 to 109.159.255.255/121,048,576
0431.112.0.0 to 31.124.255.255851,968
0531.48.0.0 to 31.55.255.255/13524,288
0695.144.0.0 to 95.151.255.255/13524,288
07217.32.180.0 to 217.39.15.255416,768
08217.39.128.0 to 217.45.23.255366,592
0931.90.0.0 to 31.94.255.255327,680
1031.100.0.0 to 31.104.255.255327,680
11147.148.0.0 to 147.152.255.255327,680
12213.120.0.0 to 213.123.255.255/14262,144
13194.72.0.0 to 194.74.79.255151,552
145.80.0.0 to 5.81.255.255/15131,072
1531.106.0.0 to 31.107.255.255/15131,072

Other networks in the United Kingdom

AS5089Virgin MediaAS5607SkyAS13285TalkTalkAS6871Plusnet

Using this network with a proxy

It targets that one network, and it is not applied on geo-forced pools. If no exit on the network is available, the request fails instead of falling back to another network. We do not publish which networks are available at a given time.

A request names it with the asn option, written AS2856 or 2856. Every pool takes it: Essential and Premium Residential, and Mobile.

Essential and Premium