SPF Raw Checker & IP Range
Inspect your raw SPF record. View authorized IP addresses, includes, and mechanisms in a clear, flattened list.
Understanding Your SPF Record
Sender Policy Framework (SPF) is a DNS text record list of IP addresses that are authorized to send email on behalf of your domain. This tool performs a recursive lookup to find all authorized IPs.
Frequently Asked Questions
What is the SPF 10-lookup limit?
RFC 7208 limits SPF processing to 10 DNS lookups to prevent denial of service attacks. If you exceed this, your emails may fail authentication.
How does this tool help?
It counts your exact lookup usage and shows you the flattened list of every IP address authorized by your record.
What is SPF Flattening?
SPF Flattening is the process of resolving all hostnames to their IP addresses and replacing them in your record, reducing the lookup count to 1.