$ query “AS21054” --type=asn → 1 result(s)
AS21054 · UK-NATWEST-AS21054
Natwest Markets PLC
AS21054 is owned by Natwest Markets PLC and is an enterprise stub network, registered in the United Kingdom since 2002. The system announces a respectable 65 536 IPv4 addresses, including a /16. Most of its address space is geolocated to the United Kingdom. This AS has recently updated its prefix announcements. No IPv6 support — it's 2026, just saying.
Basic Information
- Country
- 🇬🇧 United Kingdom
- Category
- Business
- Network Role
- Stub Network
- Data Origin
- Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
- Registered
- March 07, 2002
- Last Changed
- April 11, 2026
- Last Seen
- May 11, 2026 (active)
Prefix Summary
- IPv4 Prefixes (raw / aggregated)
- 13 / 1
- IPv6 Prefixes (raw / aggregated)
- 0 / 0
- IPv4 Addresses
- 65 536
- Largest IPv4 Prefix
- /16 (65 536 addresses)
- Geolocated Countries
- 🇬🇧 United Kingdom (131 072 IPs)
- Prefix Changed
- May 08, 2026
Reputation
- Reputation
- Pristine — 0 flagged IPs
Connectivity Summary
- Upstream Providers
- 3 upstreams providing transit
- Degree
- 3 unique BGP neighbors
- Reach
- 0 networks in customer cone
Upstream Providers (3)
Prefix Lists
IPv4 Prefixes (13 total)
- 155.136.0.0/16 (65 536 addresses (/16 prefix))