shell:$ nslookup -timeout=2 -retry=1 'crl.geotrust.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
crl.geotrust.com	canonical name = crl-symcprod.digicert.com.
crl-symcprod.digicert.com	canonical name = mpki-crl.edge.digicert.com.
mpki-crl.edge.digicert.com	canonical name = pki-ocsp.digicert.com.edgekey.net.
pki-ocsp.digicert.com.edgekey.net	canonical name = e3782.cd.akamaiedge.net.
Name:	e3782.cd.akamaiedge.net
Address: 23.60.127.21