AS204222 HMRC-AS His Majesty's Revenue and Customs

HMRC-AS His Majesty's Revenue and Customs · registered in the United Kingdom

IPv4 addresses16,3841 prefixes · <0.001% of announced IPv4

Rank in United Kingdom#213largest network in GB by IPv4 space, of 2,074 · 0.02% of GB

Rank worldwide#7,099of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited Kingdom2,261 ASNs registered there

Open AS204222 in ASN lookup Look up an IP in this network (163.171.0.1) All networks in United Kingdom

IPv4 prefixes

All 1 prefix, in address order.

163.171.0.0/18

Similar-sized networks in United Kingdom

ASNNameIPv4 addresses

AS15654#210 COMINO Civica UK Ltd.16,384

AS16334#211 Sureline-Communications-UK Sureline Communications Limited16,384

AS33820#212 REED-ELSEVIER-AS RELX GROUP PLC16,384

AS204800#214 WHG-SGP WHG Hosting Services Ltd16,384

AS199614#215 FICITY-AS-01 Fiberocity Ltd16,128

AS204997#216 FIRSTBYTE-AS FIRST SERVER LIMITED16,128

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources