shell:$ nslookup -timeout=2 -retry=1 'mc.sendgrid.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
mc.sendgrid.com	canonical name = d1l684gsaqx9yt.cloudfront.net.
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 3.170.51.30
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 3.170.51.18
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 3.170.51.6
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 3.170.51.41
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:2873:3800:1:928c:ad40:93a1
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:2873:2600:1:928c:ad40:93a1
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:2873:c600:1:928c:ad40:93a1
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:2873:be00:1:928c:ad40:93a1
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:2873:2a00:1:928c:ad40:93a1
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:2873:2200:1:928c:ad40:93a1
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:2873:4800:1:928c:ad40:93a1
Name:	d1l684gsaqx9yt.cloudfront.net
Address: 2600:9000:2873:a000:1:928c:ad40:93a1