shell:$ nslookup -timeout=2 -retry=1 'topup.eir.ie'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
topup.eir.ie	canonical name = topup-eir-ie.trustvesta.com.
Name:	topup-eir-ie.trustvesta.com
Address: 185.84.254.31