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

Non-authoritative answer:
signup.webex.com	canonical name = d3ea8exdgggr3w.cloudfront.net.
Name:	d3ea8exdgggr3w.cloudfront.net
Address: 3.160.22.21
Name:	d3ea8exdgggr3w.cloudfront.net
Address: 3.160.22.22
Name:	d3ea8exdgggr3w.cloudfront.net
Address: 3.160.22.83
Name:	d3ea8exdgggr3w.cloudfront.net
Address: 3.160.22.41
Name:	d3ea8exdgggr3w.cloudfront.net
Address: 2600:9000:25f3:f000:4:1e13:4f00:93a1
Name:	d3ea8exdgggr3w.cloudfront.net
Address: 2600:9000:25f3:4e00:4:1e13:4f00:93a1
Name:	d3ea8exdgggr3w.cloudfront.net
Address: 2600:9000:25f3:1400:4:1e13:4f00:93a1
Name:	d3ea8exdgggr3w.cloudfront.net
Address: 2600:9000:25f3:1600:4:1e13:4f00:93a1
Name:	d3ea8exdgggr3w.cloudfront.net
Address: 2600:9000:25f3:a200:4:1e13:4f00:93a1
Name:	d3ea8exdgggr3w.cloudfront.net
Address: 2600:9000:25f3:5000:4:1e13:4f00:93a1
Name:	d3ea8exdgggr3w.cloudfront.net
Address: 2600:9000:25f3:b400:4:1e13:4f00:93a1
Name:	d3ea8exdgggr3w.cloudfront.net
Address: 2600:9000:25f3:6600:4:1e13:4f00:93a1