AS15987 PORTUNITY-AS

Netnames that spell out an address in hyphens, sometimes an address that is not their own.

What it's used for

• A provider's network. Twenty-eight IPv4 prefixes and nineteen IPv6 prefixes announced from Germany, twenty-nine thousand six hundred and ninety-six addresses, across two observed BGP neighbours.

Notable

• Several netnames are the brand followed by four hyphen-separated numbers, written as an address. On five blocks the numbers do not match the block they name, so the netname refers to a larger range the block was cut from.
• One netname reads as a phrase: the brand's contraction, two words about customers who have left, a shortened city name, and another address.
• Two blocks use the registry's modern template of a country code, brand and date; another uses just the contraction and the brand. Four conventions across one holder.
• The registrants are the company plus two roles written as the company name with a hyphen and a job: management, and the master of the hosts.
• The IPv6 holdings nest inside one another under a single range, stepping from a /33 down and back out again, plus a second unrelated range.
• Twenty-nine thousand addresses across forty-seven announcements, behind only two upstreams.
• Eighteen addresses were queried for reverse DNS and none returned a name.

Interesting

• Writing the parent range into a child block's name is a habit from managing space by hand: the label answers where the addresses came from rather than what they are.
• Keeping a range labelled for departed customers rather than renaming it is how address inventories actually age.