shell:$ nslookup -timeout=2 -retry=1 'u8921323.ct.sendgrid.net'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
Name:	u8921323.ct.sendgrid.net
Address: 3.228.55.242
Name:	u8921323.ct.sendgrid.net
Address: 3.148.25.83
Name:	u8921323.ct.sendgrid.net
Address: 34.193.6.97
Name:	u8921323.ct.sendgrid.net
Address: 34.197.35.196
Name:	u8921323.ct.sendgrid.net
Address: 3.19.204.130
Name:	u8921323.ct.sendgrid.net
Address: 18.223.242.126
Name:	u8921323.ct.sendgrid.net
Address: 54.205.232.158
Name:	u8921323.ct.sendgrid.net
Address: 3.142.138.63
Name:	u8921323.ct.sendgrid.net
Address: 34.237.20.3
Name:	u8921323.ct.sendgrid.net
Address: 3.132.237.167
Name:	u8921323.ct.sendgrid.net
Address: 3.142.167.138
Name:	u8921323.ct.sendgrid.net
Address: 44.218.7.192