AS15576 NTS

Every reverse name carries this network's own AS number as one of its labels.

What it's used for

• A provider carrying its own customers and other companies' ranges. Thirty-eight IPv4 prefixes and twenty-seven IPv6 prefixes announced from Switzerland, forty-seven thousand addresses, across six hundred and forty-four observed BGP neighbours.

Notable

• All three answering addresses end their names with this network's own AS number followed by the company domain, so the routing identifier is part of the hostname.
• The names in front of that carry an interface identifier, a router number, a site code, a country code and a service label, read right to left from the widest scope inward.
• Blocks come from five differently named companies, each keeping its own netname prefix, alongside one block the registry lists as managed with no registrant at all.
• Most netnames end in an allocation date; one carries nine digits where the rest carry eight.
• Eighteen addresses were queried for reverse DNS and three returned a name.

Interesting

• Putting the AS number in every hostname means a traceroute identifies the operator without a single lookup, which is the most useful thing a reverse name can do and one of the rarest.
• Six hundred and forty-four neighbours is an enormous count for forty-seven thousand addresses. The network is worth far more as a meeting point than as a place to put servers.
• Five company names in the netnames, each with its own date, reads as a provider assembled from smaller ones without ever renaming what it bought.