AS15870 BST-AS BS-Telecom llc

Four of the five blocks carry a netname that is the company's own name with one letter wrong.

What it's used for

• A provider's network. Five IPv4 /24s and one IPv6 /48 announced from the Russian Federation, one thousand two hundred and eighty addresses, through a single observed BGP neighbour.

Notable

• Those four netnames differ from the registered company name by a single character in the second position, and the same wrong spelling was used four times.
• The fifth block's netname is an organisation handle generated by the registry, with no chosen name at all.
• Fifteen addresses were queried and all fifteen returned a name, in one scheme across every block: the word for a host with the last octet attached, then the word for a network with the first three octets hyphenated, then the company's domain.
• That domain spells the company's name correctly, so the reverse zone and the registry disagree.
• The IPv6 announcement is a single /48 against five separate IPv4 blocks.
• One thousand two hundred addresses depend on a single upstream.

Interesting

• The reverse names are the most consistent in this stretch: every address in every block follows one rule, which means the zones are generated rather than edited. The registry entries are the opposite, typed once per block, and the typo propagated because each was copied from the last.
• Splitting the address into a host part and a network part mirrors what the routing does, and makes the block obvious from any single name.