8 / 10
Lookups
1
Issue
695,824
IPv4 addresses
2.19 â‹… 10
24
IPv6 addresses
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable.
v=spf1 mx a ptr ip4:93.190.136.1 ip4:93.190.136.4 ip4:93.190.136.12 ip4:185.21.63.8 a:worldstream.nl include:_spf.psm.knowbe4.com include:spf.protection.outlook.com include:sendgrid.net -all
Copied
Terms
mx
pass
if the sender's IP address is in the A or AAAA record of this domain.
4 IPv4 addresses
4 IPv6 addresses
or else
a
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
PTR checks should no longer be used. See
RFC 7208, section 5.5
.
or else
ip4:
93.190.136.1 / 32
pass
if the sender's IP is between
93.190.136.1 and 93.190.136.1 (inclusive).
93.190.136.1 and 93.190.136.1 (inclusive).
WorldStream
AS49981
or else
ip4:
93.190.136.4 / 32
pass
if the sender's IP is between
93.190.136.4 and 93.190.136.4 (inclusive).
93.190.136.4 and 93.190.136.4 (inclusive).
WorldStream
AS49981
or else
ip4:
93.190.136.12 / 32
pass
if the sender's IP is between
93.190.136.12 and 93.190.136.12 (inclusive).
93.190.136.12 and 93.190.136.12 (inclusive).
WorldStream
AS49981
or else
ip4:
185.21.63.8 / 32
pass
if the sender's IP is between
185.21.63.8 and 185.21.63.8 (inclusive).
185.21.63.8 and 185.21.63.8 (inclusive).
WorldStream
AS49981
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
include:
_spf.psm.knowbe4.com
Evaluate this SPF record and
pass
if it
passes.
This include does nothing if the included record returns fail, soft fail, or neutral.
KnowBe4
Security training
or else
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:
sendgrid.net
Evaluate this SPF record and
pass
if it
passes.
This include does nothing if the included record returns fail, soft fail, or neutral.
SendGrid
Email automation
or else
-all
fail
the email's SPF check.
Included records
v=spf1 mx a ptr ip4:93.190.136.1 ip4:93.190.136.4 ip4:93.190.136.12 ip4:185.21.63.8 a:worldstream.nl include:_spf.psm.knowbe4.com include:spf.protection.outlook.com include:sendgrid.net -all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable
6 x ip4 -all
6 x ip4 5 x ip6 -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