rDNS: ec2-13-232-240-20.ap-south-1.compute.amazonaws.com
#Id Port Banner Type Ttl Service
4,419,910,226 22
SSH-2.0-OpenSSH_7.4
response 238 ssh
4,419,909,719 22 syn-ack 238
4,261,905,185 22
SSH-2.0-OpenSSH_7.4
response 237 ssh

This project goes around the Internet and finds services to index them.