SPF Checker

Inspect a domain's v=spf1 record, count lookups, and flag issues.

Try: google.com github.com stripe.com
Recent:

Result for github.com

v=spf1 ip4:192.30.252.0/22 include:spf.protection.outlook.com include:_netblocks.google.com include:_netblocks2.google.com include:mail.zendesk.com include:_spf.salesforce.com include:servers.mcsv.net include:mktomail.com include:sendgrid.net ip4:62.253.227.114 ip4:166.78.69.169 ip4:166.78.69.170 ip4:166.78.71.131 ~all

DNS lookups: 10 / 10

Issues

  • Warning SPF record exceeds 255 characters.
    A single DNS string is limited to 255 chars. Most resolvers handle multi-string TXT records, but some legacy ones do not.
  • Warning SPF is close to the 10-lookup limit (10 lookups).
    Adding new senders may push you over. Consider consolidating includes.