AS15640 FPIC-AS

Half the reverse names write the address with dots, turning it into four extra DNS labels.

What it's used for

• A regional broadband network inside a national operator. Eighty-eight IPv4 prefixes and one IPv6 /32 announced from the Russian Federation, sixty-seven thousand addresses, across three observed BGP neighbours.

Notable

• Two naming schemes run side by side under one domain. Some names join two octets with a hyphen; the rest write all four octets separated by dots, which makes each octet its own label in the name.
• A third scheme appears on two addresses, using a different opening word from the rest.
• Every name carries a city label, so the whole sample is placed in one place regardless of scheme.
• Most netnames use the country code, a three-letter predecessor brand and a date, one of them from the first years of the registry; two blocks instead carry a customer-style name with a number.
• Eighty-eight routes leave through three neighbours.
• Eighteen addresses were queried for reverse DNS and twelve returned a name.

Interesting

• Writing an address with dots inside a hostname is legal and quietly awkward. Tools that count labels or match on the domain see a different shape from the hyphenated names in the same zone.
• Eighty-eight routes for sixty-seven thousand addresses means the space arrived in small pieces over many years, and none of it has been consolidated since.
• The naming says these are residential subscribers. That is more than most operators publish, and it makes the whole customer footprint of one city measurable from outside.