$ for i in betfair.com theregister.co.uk acer.com telegraph.co.uk vodafone.com ups.com; do echo $i; whois $i | egrep 'ns[12]'; done
betfair.com
ns1.yumurtakabugu.com (NSYUMURT1119540)
ns2.yumurtakabugu.com (NSYUMURT1119541)
theregister.co.uk
ns1.yumurtakabugu.com
ns2.yumurtakabugu.com
acer.com
ns1.yumurtakabugu.com (NSYUMURT1119540)
ns2.yumurtakabugu.com (NSYUMURT1119541)
telegraph.co.uk
ns1.yumurtakabugu.com
ns2.yumurtakabugu.com
vodafone.com
ns1.dc-ratingen.de (NSDCRATI495)
ns2.dc-ratingen.de (NSDCRATI162)
ups.com
ns1.yumurtakabugu.com (NSYUMURT1119540)
ns2.yumurtakabugu.com (NSYUMURT1119541)