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

Non-authoritative answer:
mc.sendgrid.com	canonical name = d1l684gsaqx9yt.cloudfront.net.
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 3.167.183.93
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 3.167.183.100
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 3.167.183.127
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 3.167.183.97
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:27dd:4e00:1:928c:ad40:93a1
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:27dd:f800:1:928c:ad40:93a1
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:27dd:7400:1:928c:ad40:93a1
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:27dd:c800:1:928c:ad40:93a1
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:27dd:0:1:928c:ad40:93a1
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:27dd:c00:1:928c:ad40:93a1
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:27dd:8000:1:928c:ad40:93a1
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:27dd:4000:1:928c:ad40:93a1