AS15932 TGS-INT-NETWORK OSLO, NORWAY

The reverse names sit on a domain built from this number itself.

What it's used for

• A carrier's international network. Six IPv4 prefixes and two IPv6 prefixes announced from Norway, four thousand three hundred and fifty-two addresses, across five observed BGP neighbours.

Notable

• The one answering address returns a name on a domain that is the two letters for an autonomous system followed by this number, so the network named its reverse zone after its own routing identifier.
• That name pairs a three-letter city code with a port reference, then the same city code again with a test host for traffic measurement.
• Four blocks carry netnames ending in three-letter codes for two cities on the other side of the world, announced from a country in the far north.
• The AS handle appends a city and country in capitals, with a comma, to what is otherwise an identifier.
• One block's registry lookup failed, so its details are unknown rather than absent.
• The two IPv6 prefixes come from different ranges, one a /32 and one a /29.

Interesting

• Naming a domain after the AS number is unusually honest: it survives every rebrand, merger and change of holder, because the number is the only thing in the record that cannot be renamed.
• City codes in netnames on a carrier announcing from elsewhere mark where the equipment is, not where the company is. An international backbone's addresses live wherever it has a rack.