AS15317 — SERVEREL-AS

Network type: hosting

AS15317 announces 8 IPv4 prefixes covering 14,080 addresses and 1 IPv6 prefixes.

About this network

Four different reverse naming conventions inside a single domain.

What it's used for

• A hosting provider. Eight IPv4 prefixes and one IPv6 /32 announced from the United States, across four observed BGP neighbours.

Notable

• Seventeen of eighteen sampled addresses answered, and they use at least four formats.
• Some write the full address forwards before the domain, some write it backwards, some give only the last two octets, and two answer under a different domain entirely, marked as dynamic with the octets reversed.
• Two addresses in the same block can disagree: one gives all four octets and its neighbour gives two.
• All eight blocks carry the same netname, the company name with the protocol version and the word net, so the registry is entirely consistent while the DNS is not.
• Eighteen addresses were queried for reverse DNS and seventeen returned a name.

Interesting

• Four conventions in one zone is the signature of a zone assembled over years by different people and different scripts, each generating names for the block in front of it.
• The practical cost falls on anyone reading logs. A name here cannot be parsed by one rule, and the two octet form is ambiguous without knowing which block it came from.
• The second domain marking addresses as dynamic sits inside space registered to the hosting company, so some of this range is sold as consumer broadband under another brand.

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

Announced prefixes

• 162.221.224.0/22
• 162.252.20.0/22
• 173.214.240.0/20
• 192.133.136.0/21
• 199.182.160.0/23
• 199.182.163.0/24
• 199.182.164.0/22
• 216.172.48.0/20
• 2605:5b00::/32

Upstream networks

• AS3356 Level 3 Parent, LLC
• AS50245 Serverel Inc.
• AS3257 GTT Communications Inc.

Downstream networks

• AS50245 Serverel Inc.

Adjacent networks

• AS3356 Level 3 Parent, LLC
• AS50245 Serverel Inc.
• AS3257 GTT Communications Inc.