Sender Policy Framework (SPF) records allow domain owners to publish a list of IP addresses or subnets that are authorized to send email on their behalf.  The goal is to reduce the amount of spam and fraud by making it much harder for malicious senders to disguise their identity.

What is my IP address? Free public IP lookup.

Port scanner tool can be used to identify available services running on a server, it uses raw IP packets to find out what ports are open on a server or what Operating System is running or to check if a server has firewall enabled …