AS13000 LEON-AS

A regional Polish provider carrying an absorbed competitor's netname alongside its own.

What it's used for

• A Polish internet provider serving the south of the country. 50,432 addresses across 34 IPv4 prefixes, 32 IPv6 prefixes, and 98 observed BGP neighbours.

Notable

• Most blocks share one netname, PL-LEON-20090506, reused across at least six separate prefixes.
• Two others are bare LEON, and one is ERTEL-NET.
• Eleven of eighteen sampled addresses answered, all in the form static-188-137-47-255.leon.com.pl.
• First observed in the routing archive in August 2000.

Interesting

• One dated netname covering six prefixes means a single allocation was carved up and each piece announced separately, rather than six allocations being made over time. The date is the day the block was assigned, so every piece of it carries the same one no matter when it was routed.
• ERTEL-NET is a different company's name on a block registered to this one. Regional providers grow by buying their neighbours, and the netname is the part of the acquisition nobody bothers to rewrite, so it stays as a marker of who held the space first.
• Every answering address is labelled static, which distinguishes fixed customer assignments from the dynamic pool. Networks that publish this are telling anyone who looks which addresses belong to a business line, and that distinction matters to mail filters far more than to users.
• Thirty-two IPv6 prefixes against 34 IPv4 ones is near parity, unusual for a provider this size and a sign the deployment was done properly rather than as a token announcement.