AS15519 — IW-NET-AS GB

AS15519 announces 9 IPv4 prefixes covering 11,520 addresses and 8 IPv6 prefixes.

About this network

Twenty-four IPv6 routes against nine IPv4 ones, and the netname is written in lower case.

What it's used for

• A software company's network. Nine IPv4 prefixes and twenty-four IPv6 prefixes announced from Sweden, eleven thousand addresses, through two observed BGP neighbours.

Notable

• Five blocks carry a netname written entirely in lower case, where this field is conventionally capitals throughout.
• Three others use the same word in capitals with a digit, and are registered to a differently incorporated arm of the same company rather than the local one.
• One block's registry lookup failed, so its netname and registrant are unknown rather than absent.
• The IPv6 announcements form a staircase of /39, /40, /41, /42, /43 and /44 prefixes, each covering what the previous ones left.
• The AS handle ends in a two-letter country code that is not the country these blocks are announced from.
• Eighteen addresses were queried for reverse DNS and none returned a name.

Interesting

• More IPv6 routes than IPv4 ones is still rare, and it is what a network built recently on cloud infrastructure looks like rather than one that grew into IPv6 afterwards.
• Two corporate entities holding blocks under one AS number is normal for a multinational and awkward for anyone reading the registry: the same network has two owners depending on which block you look at.
• The lower case netname and the country code that does not match are both small inconsistencies, and both are permanent, because nothing in the registry rejects them.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 158.179.128.0/22
• 158.179.132.0/23
• 158.179.135.0/24
• 158.179.136.0/21
• 158.179.144.0/21
• 159.13.96.0/22
• 159.13.100.0/23
• 159.13.104.0/21
• 159.13.112.0/21
• 2603:c05c::/39
• 2603:c05c:1000::/38
• 2603:c05c:2000::/39
• 2603:c05c:2800::/39
• 2603:c05d::/36
• 2603:c05d:2000::/36
• 2603:c05e::/35
• 2603:c05e:4000::/35

Upstream networks

• AS6453 TATA COMMUNICATIONS (AMERICA) INC
• AS8220 COLT Technology Services Group Limited

Adjacent networks

• AS6453 TATA COMMUNICATIONS (AMERICA) INC
• AS8220 COLT Technology Services Group Limited

Routing security

• RPKI: 0 valid, 0 invalid and 31 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 39 route objects.
• Listed in as-sets: AS-EASYNETUK, AS-IIJ, AS-IIJ6, AS-NETSUITE, AS-ORACLE-OCI-DRCC-NRIALLOY, AS2497:AS-IIJ, AS2497:AS-IIJ6, AS8220:AS-COLTJP.