What is .aco?
Brand TLDs operate under Specification 13 of ICANN's registry agreement. It lets a trademark owner keep every second-level name for itself, so you won't find .aco names for sale at any registrar.
.aco entered the DNS root zone on August 27, 2015, 11 years ago. It came out of ICANN's New gTLD Program, the 2012 application round that grew the root from 22 generic TLDs to well over a thousand.
On the technical side, .aco is served by 3 authoritative name servers, every one of them reachable over IPv6. It is also DNSSEC-signed: the root zone carries a DS record for .aco, which lets validating resolvers check its answers cryptographically. Registration data is published over RDAP and WHOIS (the WHOIS server is whois.nic.aco).
.aco FAQ
What country is .aco?
None. .aco is a generic top-level domain, so it isn't tied to any country.
Who owns the .aco domain extension?
ACO Severin Ahlmann GmbH & Co. KG operates .aco as its registry, under a registry agreement with ICANN.
When was .aco created?
.aco was delegated to the DNS root zone on August 27, 2015.
Is .aco a valid domain?
Yes. .aco is an active top-level domain in the DNS root zone, delegated in 2015, so .aco addresses work in every browser.
Can I buy a .aco domain?
No. .aco is a brand TLD under ICANN Specification 13, so names are reserved for ACO Severin Ahlmann GmbH & Co. KG.
Is .aco DNSSEC-signed?
Yes, the root zone holds a DS record for .aco.
Sources
Data from IANA root zone version 2026102000. Last changed June 22, 2022. Spotted something wrong? Tell us.
