1 / 10
Lookups
0
Issues
1,025
IPv4 addresses
0
IPv6 addresses
Terms
ip4:
156.17.40.0 / 22
pass
if the sender's IP is between
156.17.40.0 and 156.17.43.255 (inclusive).
156.17.40.0 and 156.17.43.255 (inclusive).
Wroclaw Centre of Networking and Supercomputing
AS8970
or else
mx
pass
if the sender's IP address is in the A or AAAA record of this domain.
1 IPv4 address
or else
-all
fail
the email's SPF check.
Included records
v=spf1 ip4:156.17.40.0/22 mx -all
IP ranges
156.17.40.0
/ 22
Wroclaw Centre of Networking and Supercomputing
AS8970
156.17.40.0 - 156.17.43.255
1,024 IP addresses