AS16086 DNA

The reverse zone splits into four suffixes, one of which announces that the addresses behind it are shared.

What it's used for

• A national provider. Seventy-seven IPv4 prefixes and seven IPv6 prefixes announced from Finland, more than one million eight hundred thousand addresses, across eighty-two observed BGP neighbours.

Notable

• Fifteen of eighteen queried addresses answered. Every name is the four numbers of the address joined by hyphens, then one of four suffixes, then the same internet-brand domain.
• One suffix is two letters for broadband, one is two letters for a corporate service, one is the word for reverse, and one prefixes the broadband suffix with the three letters for address translation, so the zone itself says which ranges sit behind shared addresses.
• Ten netnames share a country code, the brand and a date. Nine dates carry four digits for the year and one carries only two, a survivor of the older format.
• Two of the twelve blocks looked up are registered to other companies entirely, each with its own abuse contact, inside a network otherwise held end to end by one registry role.

Interesting

• Address translation is normally invisible from outside. Naming the ranges that use it is a small courtesy to anyone tracing a connection, since it explains why one address maps to many customers.
• A provider that grew by acquisition often keeps the acquired customers' blocks under their old owners' names. Two enterprise blocks announced here still say who bought them.