11 / 10
Lookups
1
Issue
917,518
IPv4 addresses
4.38 ⋅ 10
24
IPv6 addresses
More than 10 DNS lookups were required to process this SPF record.
v=spf1 +include:spf.protection.outlook.com +include:fnhk.cz +a:diana.is.cuni.cz +a:smtp.du1.cesnet.cz +include:sparkpostmail.com -all
Copied
Terms
include:
spf.protection.outlook.com
Evaluate this SPF record and
pass
if it
passes.
This include does nothing if the included record returns fail, soft fail, or neutral.
Microsoft 365 / Outlook
Inbox software
or else
include:
fnhk.cz
Evaluate this SPF record and
pass
if it
passes.
This include does nothing if the included record returns fail, soft fail, or neutral.
or else
pass
if the sender's IP address is in the A or AAAA record of this domain.
1 IPv4 address
1 IPv6 address
or else
pass
if the sender's IP address is in the A or AAAA record of this domain.
1 IPv4 address
or else
include:
sparkpostmail.com
Evaluate this SPF record and
pass
if it
passes.
This include does nothing if the included record returns fail, soft fail, or neutral.
or else
-all
fail
the email's SPF check.
Included records
v=spf1 include:spf.protection.outlook.com include:fnhk.cz a:diana.is.cuni.cz a:smtp.du1.cesnet.cz include:sparkpostmail.com -all
More than 10 DNS lookups were required to process this SPF record
6 x ip4 5 x ip6 -all
a:antivir2.fnhk.cz a:antivir3.fnhk.cz 8 x ip4 a:mx.flame.cz a:smtp.du1.cesnet.cz include:spf.protection.outlook.com -all
6 x ip4 5 x ip6 -all
exists:%{i}._spf.sparkpostmail.com ~all
IP ranges
2a01:111:f403:8000::
/ 51
Microsoft
AS8075
2a01:111:f403:8000::
2a01:111:f403:9fff:ffff:ffff:ffff:ffff
2a01:111:f403:c000::
/ 51
Microsoft
AS8075
2a01:111:f403:c000::
2a01:111:f403:dfff:ffff:ffff:ffff:ffff
2a01:111:f403:f000::
/ 52
Microsoft
AS8075
2a01:111:f403:f000::
2a01:111:f403:ffff:ffff:ffff:ffff:ffff
2a01:111:f403:8000::
/ 51
Microsoft
AS8075
2a01:111:f403:8000::
2a01:111:f403:9fff:ffff:ffff:ffff:ffff
2a01:111:f403:c000::
/ 51
Microsoft
AS8075
2a01:111:f403:c000::
2a01:111:f403:dfff:ffff:ffff:ffff:ffff
2a01:111:f403:f000::
/ 52
Microsoft
AS8075
2a01:111:f403:f000::
2a01:111:f403:ffff:ffff:ffff:ffff:ffff