AS15840 ATT-INF001-A11 AT&T-GNS-AS15840 dr6348

The handle ends in what reads as an internal ticket reference, in lower case.

What it's used for

• A managed network provider's country entity. One IPv4 /24 announced from the Netherlands, no IPv6, two hundred and fifty-six addresses, through a single observed BGP neighbour.

Notable

• The AS handle is three parts: an inventory-style code with a three-digit number and a letter-digit suffix, then the group's initials with a division abbreviation and this AS number attached, then two lower-case letters and four digits.
• That last part follows no registry convention and reads as a change or ticket reference from whatever system the record was raised in.
• The netname begins with a country code for a country other than the one the block is announced from, followed by an abbreviation for information technology professionals.
• The block lists the country entity and a role named after the registry's abuse field.
• The routing archive did not see this number until nearly two decades after the numbers around it.
• Three addresses were queried for reverse DNS and none returned a name.

Interesting

• Global managed-network businesses run one autonomous system per country entity for legal and billing reasons, and populate the registry from an internal asset database. What leaks through is the database's own vocabulary: asset codes, division abbreviations and the reference of the request that created the record.
• A country code in a netname that disagrees with the announcement is a block moved between entities without the name being touched.