AS12976 AS-CWSVYAZ

A block registered in 2003 and later cut into four descending pieces, all keeping the same date.

What it's used for

• The Russian arm of an international corporate network services provider. 15,616 addresses across five IPv4 prefixes, one IPv6 prefix, and 13 observed BGP neighbours.

Notable

• Four blocks sit inside 212.65: a /20, a /21, a /22 and a /24, each roughly half the last.
• All four carry the netname RU-CITICTELECOM-20030828.
• A separate 213.152.128.0/19 carries RU-CITICTELECOM-20000124.
• The registry lookup for 212.65.84.0/24 failed, so nothing here describes that block's record.
• Fifteen addresses were sampled and none returned a name.

Interesting

• The halving ladder is the third seen in this range. One allocation was split into progressively smaller announcements, and because the netname was inherited by each piece, the registry still describes them as one thing while the routing table sees four. Reading prefix counts as a measure of anything requires knowing which of the two you are counting.
• The company is a Chinese-owned operator running a Russian subsidiary, and both its blocks predate that ownership. Corporate network providers are bought and sold as going concerns, address space included, and the netnames were rewritten to the current owner while the dates were kept.
• Thirteen neighbours for a corporate network services provider is the shape of the business: the customers are companies reached over private connections, and the public peering exists to carry their internet traffic rather than to attract anyone.
• Nothing answers reverse lookups, consistent with space used for managed corporate connections.