shell:$ nslookup -timeout=2 -retry=1 'cognito-identity.ap-northeast-1.amazonaws.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
Name:	cognito-identity.ap-northeast-1.amazonaws.com
Address: 3.113.186.159
Name:	cognito-identity.ap-northeast-1.amazonaws.com
Address: 54.248.232.33
Name:	cognito-identity.ap-northeast-1.amazonaws.com
Address: 35.79.253.215
Name:	cognito-identity.ap-northeast-1.amazonaws.com
Address: 2406:da14:1c2d:e402:5230:1d22:329d:30c9
Name:	cognito-identity.ap-northeast-1.amazonaws.com
Address: 2406:da14:1c2d:e401:36fc:57f2:9aad:1127
Name:	cognito-identity.ap-northeast-1.amazonaws.com
Address: 2406:da14:1c2d:e400:816:9760:e53:93c6