소켓통신에서 43번 포트로 연결해서 질의하는 거구요.
"domain 도메인명" 으로 호출하시면 됩니다.


com - whois.verisign-grs.com
net - whois.verisign-grs.com
org - whois.publicinterestregistry.net
info - whois.afilias.info
name - whois.nic.name
biz - whois.neulevel.biz
aero - whois.information.aero
cc - whois.nic.cc
bz - whois.belizenic.bz
us - whois.nic.us
cn - whois.cnnic.net.cn
tw - whois.twnic.net
sh - whois.nic.sh
ac - whois.nic.ac
nu - whois.nic.nu
jp - whois.nic.ad.jp
kr - whois.nic.or.kr
hk - whois.hkdnr.net.hk
th - whois.thnic.net
in - whois.ncst.ernet.in
ae - whois.uaenic.ae
ag - whois.nic.ag
am - whois.amnic.net
arpa - whois.iana.org
as - whois.nic.as
at - whois.nic.at
au - whois.ausregistry.net.au
be - whois.dns.be
bg - whois.register.bg
br - whois.nic.br
ca - whois.cira.ca
cd - whois.nic.cd
ch - whois.nic.ch
ck - whois.nic.ck
cl - whois.nic.cl
cx - whois.nic.cx
cz - whois.nic.cz
de - whois.denic.de
dk - whois.dk-hostmaster.dk
edu - whois.educause.net
ee - whois.eenet.ee
fj - whois.usp.ac.fj
fo - whois.ripe.net
fr - whois.nic.fr
gf - whois.nplus.gf
gg - whois.channelisles.net
gl - whois.ripe.net
gm - whois.ripe.net
gov - whois.nic.gov
gs - whois.adamsnames.tc
hm - whois.registry.hm
hu - whois.nic.hu
id - whois.idnic.net.id
ie - whois.domainregistry.ie
il - whois.isoc.org.il
int - whois.iana.org
io - whois.nic.io
ir - whois.nic.ir
is - whois.isnet.is
it - whois.nic.it
je - whois.channelisles.net
kg - whois.domain.kg
kz - whois.domain.kz
la - whois.nic.la
li - whois.nic.li
lk - whois.nic.lk
lt - whois.ripe.net
lu - whois.dns.lu
lv - whois.nic.lv
ly - whois.lydomains.com
mc - whois.ripe.net
mil - whois.nic.mil
mm - whois.nic.mm
mn - whois.nic.mn
ms - whois.adamsnames.tc
museum - whois.museum
mx - whois.nic.mx
nc - whois.cctld.nc
ng - whois.rg.net
nl - whois.domain-registry.nl
no - whois.norid.no
nz - whois.srs.net.nz
pe - whois.nic.pe
pl - whois.dns.pl
pm - whois.nic.fr
pro - whois.nic.pro
pt - whois.dns.pt
pw - whois.nic.pw
re - whois.nic.fr
ro - whois.rotld.ro
ru - whois.ripn.net
sa - whois.saudinic.net.sa
sb - whois.nic.net.sb
se - whois.nic-se.se
sg - whois.nic.net.sg
si - whois.arnes.si
sk - whois.ripe.net
sm - whois.ripe.net
sr - whois.register.sr
st - whois.nic.st
su - whois.ripn.net
tc - whois.adamsnames.tc
tf - whois.adamsnames.tc
tj - whois.nic.tj
tk - whois.dot.tk
tm - whois.nic.tm
tn - whois.ati.tn
to - whois.tonic.to
tr - whois.metu.edu.tr
tv - whois.tv
ua - whois.net.ua
uk - whois.nic.uk
va - whois.ripe.net
vc - whois.opensrs.net
vg - whois.adamsnames.tc
ws - whois.samoanic


출처 : phpschool