https://en.wikipedia.org/w/api.php?action=query&meta=siteinfo&siprop=interwikimap&sifilteriw=local
<iw prefix="chapter" local="" url="https://en.wikimedia.org/wiki/$1" />
reedy@fenari:~$ nslookup en.wikimedia.org
Server: 208.80.152.131
Address: 208.80.152.131#53
- server can't find en.wikimedia.org: NXDOMAIN
reedy@fenari:~
Version: wmf-deployment
Severity: normal