12 / 10
Lookups
2
Issues
1,291,622
IPv4 addresses
1.09 â‹… 10
29
IPv6 addresses
There are 2 issues with this SPF record
- The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable.
- More than 10 DNS lookups were required to process this SPF record.
v=spf1 ip4:128.30.0.0/15 ip4:18.26.0.0/16 ip4:18.31.0.0/16 ip4:128.52.0.0/16 ip6:2603:400a::/32 ptr mx include:mit.edu ~all
Copied
Terms
ip4:
128.30.0.0 / 15
pass
if the sender's IP is between
128.30.0.0 and 128.31.255.255 (inclusive).
128.30.0.0 and 128.31.255.255 (inclusive).
Massachusetts Institute of Technology
AS3
or else
ip4:
18.26.0.0 / 16
pass
if the sender's IP is between
18.26.0.0 and 18.26.255.255 (inclusive).
18.26.0.0 and 18.26.255.255 (inclusive).
Massachusetts Institute of Technology
AS3
or else
ip4:
18.31.0.0 / 16
pass
if the sender's IP is between
18.31.0.0 and 18.31.255.255 (inclusive).
18.31.0.0 and 18.31.255.255 (inclusive).
Massachusetts Institute of Technology
AS3
or else
ip4:
128.52.0.0 / 16
pass
if the sender's IP is between
128.52.0.0 and 128.52.255.255 (inclusive).
128.52.0.0 and 128.52.255.255 (inclusive).
Massachusetts Institute of Technology
AS3
or else
ip6:
2603:400a:: / 32
pass
if the sender's IP is between
2603:400a:: and 2603:400a:ffff:ffff:ffff:ffff:ffff:ffff (inclusive).
2603:400a:: and 2603:400a:ffff:ffff:ffff:ffff:ffff:ffff (inclusive).
Massachusetts Institute of Technology
AS3
or else
PTR checks should no longer be used. See
RFC 7208, section 5.5
.
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
include:
mit.edu
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
soft fail
the email's SPF check.
Included records
v=spf1 ip4:128.30.0.0/15 ip4:18.26.0.0/16 ip4:18.31.0.0/16 ip4:128.52.0.0/16 ip6:2603:400a::/32 ptr mx include:mit.edu ~all
The 'ptr' mechanism shouldn't be used because it's slow, resource intensive, and not very reliable
More than 10 DNS lookups were required to process this SPF record
include:_s00430413.autospf.email -all
24 x ip4 include:_s004304130.autospf.email -all
23 x ip4 include:_s004304131.autospf.email -all
22 x ip4 include:_s004304132.autospf.email -all
21 x ip4 include:_s004304133.autospf.email -all
20 x ip4 include:_s004304134.autospf.email -all
19 x ip4 include:_s004304135.autospf.email -all
11 x ip4 6 x ip6 include:_s004304136.autospf.email -all
9 x ip6 exists:%{i}._spf.mta.salesforce.com -all
IP ranges
128.30.0.0
/ 15
Massachusetts Institute of Technology
AS3
128.30.0.0 - 128.31.255.255
131,072 IP addresses
18.26.0.0
/ 16
Massachusetts Institute of Technology
AS3
18.26.0.0 - 18.26.255.255
65,536 IP addresses
18.31.0.0
/ 16
Massachusetts Institute of Technology
AS3
18.31.0.0 - 18.31.255.255
65,536 IP addresses
128.52.0.0
/ 16
Massachusetts Institute of Technology
AS3
128.52.0.0 - 128.52.255.255
65,536 IP addresses
2603:400a::
/ 32
Massachusetts Institute of Technology
AS3
2603:400a::
2603:400a:ffff: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