DROP all -- localhost/8 anywhere

[PermaNoob]

I can't figure out why this is in iptables:
DROP all -- localhost/8 anywhere

and when I try to remove it, I get:

server:~# iptables -D INPUT -s localhost/8 -j DROP
iptables: Bad rule (does a matching rule exist in that chain?)

Server is working ok, as far as I can tell.

[pititis]

List the chain and then remove it:

iptables -L INPUT -n --line-numbers

iptables -D INPUT x

where x is the number for the rule.

Cheers