nslookup

penta% nslookup
Default Server:  vortex.ufrgs.br
Address:  143.54.1.7

> www.procergs.com.br
Server:  vortex.ufrgs.br
Address:  143.54.1.7

Non-authoritative answer:
Name:    zeta.procergs.com.br
Address:  200.248.240.33
Aliases:  www.procergs.com.br

> 143.54.1.124
Server:  vortex.ufrgs.br
Address:  143.54.1.7

Name:    tigrao.ufrgs.br
Address:  143.54.1.124