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Lookups
1
Issue
458,761
IPv4 addresses
2.19 ⋅ 10
24
IPv6 addresses
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable.
v=spf1 a mx ptr ip4:192.61.136.222 ip4:52.26.18.86 ip4:104.239.217.173 include:spf.protection.outlook.com ~all
Copied
Terms
a
pass
if the sender's IP address is in the A or AAAA record of this domain.
2 IPv4 addresses
or else
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
PTR checks should no longer be used. See
RFC 7208, section 5.5
.
or else
ip4:
192.61.136.222 / 32
pass
if the sender's IP is between
192.61.136.222 and 192.61.136.222 (inclusive).
192.61.136.222 and 192.61.136.222 (inclusive).
Charter Communications
AS12271
or else
ip4:
52.26.18.86 / 32
pass
if the sender's IP is between
52.26.18.86 and 52.26.18.86 (inclusive).
52.26.18.86 and 52.26.18.86 (inclusive).
Amazon.com
AS16509
or else
ip4:
104.239.217.173 / 32
pass
if the sender's IP is between
104.239.217.173 and 104.239.217.173 (inclusive).
104.239.217.173 and 104.239.217.173 (inclusive).
Rackspace Hosting
AS19994
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
~all
soft fail
the email's SPF check.
Included records
v=spf1 a mx ptr ip4:192.61.136.222 ip4:52.26.18.86 ip4:104.239.217.173 include:spf.protection.outlook.com ~all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable
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