AS6742 ATT-CH-0E AT&T EMEA dr6348

ATT-CH-0E is one of the many small autonomous systems operated by AT&T Global Network Services, the managed-networking arm of AT&T, registered in RIPE through its Netherlands entity. The AT&T EMEA (dr6348) description is an internal AT&T service reference, not a company name.

What it's used for

• Managed enterprise connectivity rather than public internet service. The AS announces a single /24, part of a provider-independent assignment held by AT&T with netname CH-ITPRO-NET and a registered address in Basel, Switzerland — hence the CH in the handle.
• No reverse DNS is published on the block, which is normal for a closed corporate network that has no reason to advertise its hosts.

Notable

• Read this as AT&T-operated addressing for a single enterprise site or service, not as an AT&T backbone AS. AT&T's global IP transit lives in far larger autonomous systems; this one exists to give one managed customer network its own routing identity.
• The registry country (Netherlands) is where the AT&T legal entity sits; the network it serves is in Switzerland. Registration country and traffic geography are not the same thing here.

Interesting

• Large managed-service carriers accumulate long tails of AS numbers like this one — each a leftover of a specific customer engagement, each too small to be worth reclaiming, each carrying an opaque internal code in its description forever.