shell:$ nslookup -timeout=2 -retry=1 'pdf.io'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	pdf.io
Address: 172.67.68.74
Name:	pdf.io
Address: 104.26.8.229
Name:	pdf.io
Address: 104.26.9.229
Name:	pdf.io
Address: 2606:4700:20::ac43:444a
Name:	pdf.io
Address: 2606:4700:20::681a:8e5
Name:	pdf.io
Address: 2606:4700:20::681a:9e5