You requested a /whois so end of whois reply is correct.
And as CyberBotX mentioned it's the uppercase form for [].
Try /whois *Dan* and you will get
*Dan* End of /WHOIS list.
It looks like a bug but it's a feature to /whois more than just one

:::: (/whois Senc)
:::: is senc@wb-clans.com (resolved: 83.145.248.3) (ping: 71ms) * senc
:::: on some channels
:::: using *.quakenet.org [QuakeNet IRC Server]
:::: is authed as _coffe_
::::::::
:::: (/whois Sephiroth)
:::: is sephiroth@cyberscripters.org (resolved: 62.75.244.219) (ping: 51ms) * Christopher 'Sephiroth' R.
:::: on some channels
:::: using underworld1.no.quakenet.org [Underworld IRC Services, Trondheim, Norway]
:::: is authed as Sephiroth
:::: has been idle 0days, 00:00:22, signed on Wed Jul 09 03:13:36 2008, online for 5days, 09:00:49
:::: (/whois Se*)