AS15433 TISM Telecom Italia San Marino.

The microstate's carrier, with four different company names across its records.

What it's used for

• The incumbent carrier of a microstate. Nine IPv4 prefixes announced from San Marino, no IPv6, twenty thousand addresses, across thirty-nine observed BGP neighbours.

Notable

• Every netname begins with the country code and a fourth company name that appears nowhere else: not the handle, not the holder, not the reverse domain.
• The oldest of those netnames carries a six digit date while the rest use eight, so the convention changed between the first allocation and the others.
• Two blocks are dated one day apart, which is what a single request split into two allocations looks like.
• The answering addresses use the word host, the full address in dashes, and usually a word for dynamic, under two domains: one under the country's own top level domain and one under a commercial suffix.
• Eighteen addresses were queried for reverse DNS and six returned a name.

Interesting

• Thirty-nine neighbours for a state of this size is the striking figure. A country's only carrier has to reach everywhere, and the population it serves does not reduce that requirement.
• Sovereign top level domains are a small country's most visible asset online, and using it for subscriber reverse names is a quiet assertion of that.
• One block's netname marks it for a specific access technology while the rest are generic, so that space is set aside for a product rather than a customer.