Strange url....?

for .ac has a record, unlike, for example. zone .EN. .io, which is a record. Perhaps because they are relatively fresh. Why so done — we can only guess.
# dig ac
\r
; <<>> DiG 9.3.1 <<>> ac
;; global options: printcmd
;; Got answer:
;; ->>HEADER<< — opcode: QUERY, status: NOERROR, id: 58178
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 7, ADDITIONAL: 0
\r
;; QUESTION SECTION:
;ac. IN A
\r
;; ANSWER SECTION:
ac. 85584 IN A 193.223.78.210
\r
;; AUTHORITY SECTION:
ac. 85584 IN NS b.ns13.net.
ac. 85584 IN NS b.nic.io.
ac. 85584 IN NS b.nic.ac.
ac. 85584 IN NS a.nic.ac.
ac. 85584 IN NS ns3.icb.co.uk.
ac. 85584 IN NS ns1.communitydns.net.
ac. 85584 IN NS a.ns13.net.

Because for ac. there is a domain record pointing to the server that responds to http (perhaps even contains entries on the relevant virtual host)
\r
Nothing special in this.

it does not related to the area ".as" is your browser courtesy of starting to sort the suffixes starting with ".com"

thank you, Mozilla's gone rogue.
but usually it shows the real address which crept, and here I even have links within the website refer to this AC.