AS15625 — ING-AS Amsterdam

AS15625 announces 2 IPv4 prefixes covering 81,920 addresses and 0 IPv6 prefixes.

About this network

Two ranges are announced whole, in twenty pieces, with nothing left over.

What it's used for

• A bank's network. Twenty IPv4 prefixes announced from the Netherlands, no IPv6, eighty-one thousand addresses, across four observed BGP neighbours.

Notable

• Eleven routes tile one range completely, from a /17 down through a /24, covering every address in it with no gaps and no overlaps.
• Nine more routes do the same to a second, smaller range, again exactly and again in pieces of four different sizes.
• Every block carries the identical netname naming the banking group, so the registry cannot tell the pieces apart at all.
• One block's registry lookup failed, so its details are unknown rather than absent.
• Four neighbours carry eighty-one thousand addresses.
• Eighteen addresses were queried for reverse DNS and none returned a name.

Interesting

• Announcing every piece of a range separately when the range itself would do is a choice made somewhere inside the bank, and it costs the rest of the internet nineteen extra routing entries.
• The arithmetic is exact in both ranges, which means the split follows an internal plan rather than accumulated history. Someone drew this map on purpose.
• Eighty-one thousand addresses with no IPv6 and nothing answering in reverse is a network built for internal use, where the addresses are inventory rather than a public presence.

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

Announced prefixes

• 145.221.0.0/16
• 156.114.128.0/18

Upstream networks

• AS19905 Vercara, LLC
• AS198949 Radware Ltd
• AS702 Verizon Business
• AS1273 IDDQD-AS

Adjacent networks

• AS19905 Vercara, LLC
• AS198949 Radware Ltd
• AS702 Verizon Business
• AS1273 IDDQD-AS