SPF Record Checker

Please enter a host name to check.

Example host names with SPF records:
ipswitch.com, microsoft.com, google.com, gmail.com, apple.com, postini.com, ebay.com, orange.ch, bitcointalk.org, thecannells.org, facebook.com, shaw.ca, ubs.com, kitterman.com

SPF checker created by an author of the SPF RFC4408.
http://www.kitterman.com/spf/validate.html

 

The following nameservers for the host name shaw.ca were found.
a3-64.akam.net
a6-65.akam.net
a8-66.akam.net
a9-67.akam.net
a1-220.akam.net
ns7nocg.shawcable.net
ns8socg.shawcable.net
ns9htok.shawcable.net

The following rules for the host name shaw.ca were found. A total of 2 queries (as defined by RFC4408) were performed for fetching SPF and related records.
The DNS lookups for SPF took 377msec.
  1. Allow if the IP matches an MX record of shaw.ca
    1. shw-central.mx.a.cloudfilter.net.
      1. 15.222.199.59
      2. 3.96.81.40
  2. Allow all from the range 3.97.99.32/31 (3.97.99.32 - 3.97.99.33)
  3. Allow all from the range 3.97.99.42/31 (3.97.99.42 - 3.97.99.43)
  4. Allow all from the range 64.59.134.0/25 (64.59.134.0 - 64.59.134.127)
  5. Allow all from the range 64.59.136.128/27 (64.59.136.128 - 64.59.136.159)
  6. Allow all from the range 204.209.208.40/31 (204.209.208.40 - 204.209.208.41)
  7. Allow all from the range 204.209.208.150/28 (204.209.208.150 - 204.209.208.159)
  8. Inlcude 13 allow rules from host amazonses.com.
    1. Allow all from the range 199.255.192.0/22 (199.255.192.0 - 199.255.195.255)
    2. Allow all from the range 199.127.232.0/22 (199.127.232.0 - 199.127.235.255)
    3. Allow all from the range 54.240.0.0/18 (54.240.0.0 - 54.240.63.255)
    4. Allow all from the range 69.169.224.0/20 (69.169.224.0 - 69.169.239.255)
    5. Allow all from the range 23.249.208.0/20 (23.249.208.0 - 23.249.223.255)
    6. Allow all from the range 23.251.224.0/19 (23.251.224.0 - 23.251.255.255)
    7. Allow all from the range 76.223.176.0/20 (76.223.176.0 - 76.223.191.255)
    8. Allow all from the range 54.240.64.0/19 (54.240.64.0 - 54.240.95.255)
    9. Allow all from the range 54.240.96.0/19 (54.240.96.0 - 54.240.127.255)
    10. Allow all from the range 76.223.128.0/19 (76.223.128.0 - 76.223.159.255)
    11. Allow all from the range 216.221.160.0/19 (216.221.160.0 - 216.221.191.255)
    12. Allow all from the range 206.55.144.0/20 (206.55.144.0 - 206.55.159.255)
    13. Deny all IPs which do not match any previous rule
  9. Soft deny all IPs which do not match any previous rule