AS16246 AS16246 NEJ.cz s.r.o

The holder field starts with the AS number, the handle names a different company, and the hostnames name a third.

What it's used for

• A national provider's network. Fifteen prefixes announced from Czechia, two of them IPv6, one hundred and thirty-three thousand one hundred and twenty addresses, through fourteen observed BGP neighbours.

Notable

• The holder field begins with the two letters for an autonomous system and this network's own number, then the carrier's name. The field describes itself before it describes the company.
• The AS handle begins the same way and then names a smaller regional provider instead, with its own legal suffix.
• Eleven blocks share one netname scheme: a country code, an older network brand, and a full date, with dates spanning eleven years. Two more carry a country code and the regional provider's brand.
• Every block lists the same three contacts, the first of which is a bare four-digit number followed by the words for technical and administrative.
• Three of eighteen queried addresses answered, all the address with hyphens, the word for a client, and a fourth brand's domain.

Interesting

• Four names for one network is what happens when a national carrier absorbs a regional one that had already absorbed others. Each layer updated the field it cared about and left the rest.
• A numeric contact handle is a registry identifier that leaked into the human-readable part of the record. It is stable, unique, and tells a reader nothing at all about who answers.