SPF Check:
nasa.gov

1. Specify domain name

Enter a domain to be checked for the SPF record
2. Specify IP address (optional)
Enter any IP address to check if it is authorized to send e-mails by the SPF record

What is the SPF lookup for?

With the SPF lookup you analyze the SPF record of a domain for errors, security risks and authorized IP addresses. Optionally, you can specify an IP address to check if it is authorized to send e-mail on behalf of the domain. The SPF lookup analyzes registered TXT records in real time. If you want to specify an SPF record manually, use the SPF Analyzer.

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SPF check passed

Your SPF record check result
  •   SPF record found
  •   Syntax check: 0 errors
  •   Email Anti-Spoofing: Good
Summary of the SPF check

Does a valid SPF record exist?
An SPF record was found for the domain nasa.gov.
The SPF record for nasa.gov is valid.
The syntax check of the SPF record shows no obvious errors.

Which IP-s are legitimate to send emails?
The SPF record contains a reference to external rules, which means that the validity of the SPF record depends on at least one other domain. A detailed list of the rules used externally can be found in the analysis result. In total, 95 IP address(es) were authorized by the SPF record to send emails.

The SPF record analysis was performed on 17.11.2024 at 06:27:46 clock.

Lookup for the domain:
nasa.gov
IP address to be checked:
no IP address specified
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Evaluation for the domain nasa.gov 

Nameserverset:
a14-67.akam.net
a1-32.akam.net
a12-64.akam.net
a5-66.akam.net
a8-66.akam.net
a9-64.akam.net
Determined SPF record:
Legitimated IP addresses:
IP Provider / ASN DNSBL-Check
198.117.0.161 AS297 blacklist 
198.117.0.162 AS297 blacklist 
198.117.1.161 AS297 blacklist 
198.117.1.162 AS297 blacklist 
136.178.240.5 AS270 blacklist 
192.92.190.0/24
- blacklist 
192.92.191.0/24
- blacklist 
192.92.192.0/24
- blacklist 
128.102.12.121 AS270 blacklist 
128.102.12.122 AS270 blacklist 
130.134.81.136 AS270 blacklist 
128.156.250.70 AS297 blacklist 
128.183.245.24 AS270 blacklist 
128.102.12.131 AS270 blacklist 
128.102.12.132 AS270 blacklist 
128.102.12.133 AS270 blacklist 
128.102.3.200 AS270 blacklist 
128.102.22.46 AS270 blacklist 
128.102.12.20 AS270 blacklist 
143.232.190.164 AS270 blacklist 
128.157.183.13 AS270 blacklist 
198.117.132.19 AS297 blacklist 
148.114.252.16 AS270 blacklist 
198.116.134.103 AS297 blacklist 
128.159.63.152 AS1843-7 blacklist 
198.117.0.201 AS297 blacklist 
198.117.0.214 AS297 blacklist 
198.117.0.215 AS297 blacklist 
198.117.0.216 AS297 blacklist 
198.117.1.201 AS297 blacklist 
198.117.1.214 AS297 blacklist 
198.117.1.215 AS297 blacklist 
198.117.1.216 AS297 blacklist 
198.117.0.151 AS297 blacklist 
198.117.0.152 AS297 blacklist 
198.117.0.153 AS297 blacklist 
198.117.0.154 AS297 blacklist 
198.117.1.151 AS297 blacklist 
198.117.1.152 AS297 blacklist 
198.117.1.153 AS297 blacklist 
198.117.1.154 AS297 blacklist 
198.117.0.202 AS297 blacklist 
198.117.1.202 AS297 blacklist 
128.183.210.99 AS270 blacklist 
169.154.216.33 NASA-HPCC-ESS blacklist 
169.154.217.17 NASA-HPCC-ESS blacklist 
128.183.16.133 AS270 blacklist 
128.183.16.143 AS270 blacklist 
128.183.96.236 AS270 blacklist 
169.154.156.35 NASA-HPCC-ESS blacklist 
169.154.156.36 NASA-HPCC-ESS blacklist 
128.183.31.23 AS270 blacklist 
198.118.114.180/30
AS297 blacklist 
198.118.195.99 AS1848 blacklist 
129.165.41.104 AS1701 blacklist 
129.165.43.104 AS1701 blacklist 
129.165.92.46 AS1701 blacklist 
129.165.92.62 AS1701 blacklist 
129.165.43.118 AS1701 blacklist 
129.165.41.118 AS1701 blacklist 
129.165.43.119 AS1701 blacklist 
129.165.43.120 AS1701 blacklist 
150.144.200.16 AS1701 blacklist 
150.144.200.48 AS1701 blacklist 
198.118.192.20 AS1848 blacklist 
198.118.196.16 AS1848 blacklist 
198.116.65.188 AS297 blacklist 
198.119.134.205 AS297 blacklist 
128.156.249.229 AS297 blacklist 
128.149.137.96 JPL-AS127 blacklist 
128.149.139.105 JPL-AS127 blacklist 
128.149.139.106 JPL-AS127 blacklist 
128.149.139.109 JPL-AS127 blacklist 
169.154.146.140 NASA-HPCC-ESS blacklist 
169.154.146.141 NASA-HPCC-ESS blacklist 
129.164.30.24 AS297 blacklist 
2001:4d0:8302:1100::151 AS297 blacklist 
2001:4d0:8302:1100::152 AS297 blacklist 
2001:4d0:8302:1100::153 AS297 blacklist 
2001:4d0:8302:1100::154 AS297 blacklist 
2001:4d0:a302:1100::151 AS297 blacklist 
2001:4d0:a302:1100::152 AS297 blacklist 
2001:4d0:a302:1100::153 AS297 blacklist 
2001:4d0:a302:1100::154 AS297 blacklist 
40.92.0.0/15
MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
40.107.0.0/16
MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
52.100.0.0/15
MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
52.102.0.0/16
MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
52.103.0.0/17
MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
104.47.0.0/17
MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
2a01:111:f400::/48
MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
2a01:111:f403::/49
MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
2a01:111:f403:8000::/51
MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
2a01:111:f403:c000::/51
MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
2a01:111:f403:f000::/52
MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
SPF-Syntax Check:
Analysis result of the SPF record for the domain: nasa.gov

SPF record available?

We found an SPF record for the domain.

v=spf1

Additional external SPF records

We could find other records authorized in the SPF record

include:_spf-4a.nasa.gov
v=spf1 ip4:198.117.0.161 ip4:198.117.0.162 ip4:198.117.1.161 ip4:198.117.1.162 ip4:136.178.240.5 ip4:192.92.190.0/24 ip4:192.92.191.0/24 ip4:192.92.192.0/24 -all
ipv4:
198.117.0.161
ipv4:
198.117.0.162
ipv4:
198.117.1.161
ipv4:
198.117.1.162
ipv4:
136.178.240.5
ipv4:
192.92.190.0/24
ipv4:
192.92.191.0/24
ipv4:
192.92.192.0/24
include:_spf-4b.nasa.gov
v=spf1 ip4:128.102.12.121 ip4:128.102.12.122 ip4:130.134.81.136 ip4:128.156.250.70 ip4:128.183.245.24 ip4:128.102.12.131 ip4:128.102.12.132 ip4:128.102.12.133 ip4:128.102.3.200 ip4:128.102.22.46 ip4:128.102.12.20 ip4:143.232.190.164 -all
ipv4:
128.102.12.121
ipv4:
128.102.12.122
ipv4:
130.134.81.136
ipv4:
128.156.250.70
ipv4:
128.183.245.24
ipv4:
128.102.12.131
ipv4:
128.102.12.132
ipv4:
128.102.12.133
ipv4:
128.102.3.200
ipv4:
128.102.22.46
ipv4:
128.102.12.20
ipv4:
143.232.190.164
include:_spf-4c.nasa.gov
v=spf1 ip4:128.157.183.13 ip4:198.117.132.19 ip4:148.114.252.16 ip4:198.116.134.103 ip4:128.159.63.152 ip4:198.117.0.201 ip4:198.117.0.214 ip4:198.117.0.215 ip4:198.117.0.216 ip4:198.117.1.201 ip4:198.117.1.214 ip4:198.117.1.215 ip4:198.117.1.216 -all
ipv4:
128.157.183.13
ipv4:
198.117.132.19
ipv4:
148.114.252.16
ipv4:
198.116.134.103
ipv4:
128.159.63.152
ipv4:
198.117.0.201
ipv4:
198.117.0.214
ipv4:
198.117.0.215
ipv4:
198.117.0.216
ipv4:
198.117.1.201
ipv4:
198.117.1.214
ipv4:
198.117.1.215
ipv4:
198.117.1.216
include:_spf-4d.nasa.gov
v=spf1 ip4:198.117.0.151 ip4:198.117.0.152 ip4:198.117.0.153 ip4:198.117.0.154 ip4:198.117.1.151 ip4:198.117.1.152 ip4:198.117.1.153 ip4:198.117.1.154 ip4:198.117.0.202 ip4:198.117.1.202 -all
ipv4:
198.117.0.151
ipv4:
198.117.0.152
ipv4:
198.117.0.153
ipv4:
198.117.0.154
ipv4:
198.117.1.151
ipv4:
198.117.1.152
ipv4:
198.117.1.153
ipv4:
198.117.1.154
ipv4:
198.117.0.202
ipv4:
198.117.1.202
unknown:
include:_spf-4g.nasa.gov
v=spf1 ip4:128.183.210.99 ip4:169.154.216.33 ip4:169.154.217.17 ip4:128.183.16.133 ip4:128.183.16.143 ip4:128.183.96.236 ip4:169.154.156.35 ip4:169.154.156.36 ip4:128.183.31.23 ip4:198.118.114.180/30 ip4:198.118.195.99 -all
ipv4:
128.183.210.99
ipv4:
169.154.216.33
ipv4:
169.154.217.17
ipv4:
128.183.16.133
ipv4:
128.183.16.143
ipv4:
128.183.96.236
ipv4:
169.154.156.35
ipv4:
169.154.156.36
ipv4:
128.183.31.23
ipv4:
198.118.114.180/30
ipv4:
198.118.195.99
include:_spf-4m.nasa.gov
v=spf1 ip4:129.165.41.104 ip4:129.165.43.104 ip4:129.165.92.46 ip4:129.165.92.62 ip4:129.165.43.118 ip4:129.165.41.118 ip4:129.165.43.119 ip4:129.165.43.120 ip4:150.144.200.16 ip4:150.144.200.48 ip4:198.118.192.20 ip4:198.118.196.16 -all
ipv4:
129.165.41.104
ipv4:
129.165.43.104
ipv4:
129.165.92.46
ipv4:
129.165.92.62
ipv4:
129.165.43.118
ipv4:
129.165.41.118
ipv4:
129.165.43.119
ipv4:
129.165.43.120
ipv4:
150.144.200.16
ipv4:
150.144.200.48
ipv4:
198.118.192.20
ipv4:
198.118.196.16
include:_spf-4x.nasa.gov
v=spf1 ip4:198.116.65.188 ip4:198.119.134.205 ip4:128.156.249.229 ip4:128.149.137.96 ip4:128.149.139.105 ip4:128.149.139.106 ip4:128.149.139.109 ip4:169.154.146.140 ip4:169.154.146.141 ip4:129.164.30.24 -all
ipv4:
198.116.65.188
ipv4:
198.119.134.205
ipv4:
128.156.249.229
ipv4:
128.149.137.96
ipv4:
128.149.139.105
ipv4:
128.149.139.106
ipv4:
128.149.139.109
ipv4:
169.154.146.140
ipv4:
169.154.146.141
ipv4:
129.164.30.24
include:_spf-6a.nasa.gov
v=spf1 ip6:2001:4d0:8302:1100::151 ip6:2001:4d0:8302:1100::152 ip6:2001:4d0:8302:1100::153 ip6:2001:4d0:8302:1100::154 ip6:2001:4d0:a302:1100::151 ip6:2001:4d0:a302:1100::152 ip6:2001:4d0:a302:1100::153 ip6:2001:4d0:a302:1100::154 -all
ipv6:
2001:4d0:8302:1100::151
ipv6:
2001:4d0:8302:1100::152
ipv6:
2001:4d0:8302:1100::153
ipv6:
2001:4d0:8302:1100::154
ipv6:
2001:4d0:a302:1100::151
ipv6:
2001:4d0:a302:1100::152
ipv6:
2001:4d0:a302:1100::153
ipv6:
2001:4d0:a302:1100::154
unknown:
include:spf.protection.outlook.com
v=spf1 ip4:40.92.0.0/15 ip4:40.107.0.0/16 ip4:52.100.0.0/15 ip4:52.102.0.0/16 ip4:52.103.0.0/17 ip4:104.47.0.0/17 ip6:2a01:111:f400::/48 ip6:2a01:111:f403::/49 ip6:2a01:111:f403:8000::/51 ip6:2a01:111:f403:c000::/51 ip6:2a01:111:f403:f000::/52 -all
ipv4:
40.92.0.0/15
ipv4:
40.107.0.0/16
ipv4:
52.100.0.0/15
ipv4:
52.102.0.0/16
ipv4:
52.103.0.0/17
ipv4:
104.47.0.0/17
ipv6:
2a01:111:f400::/48
ipv6:
2a01:111:f403::/49
ipv6:
2a01:111:f403:8000::/51
ipv6:
2a01:111:f403:c000::/51
ipv6:
2a01:111:f403:f000::/52

E-Mail handling

How should the checkHost() function of the e-mail server handle the e-mail? (syntax )

-all
Fail (non-compliant e-mails are rejected)

Will be forwarded to another SPF record?

There is no reference to any other SPF record

Are the server addresses allowed to send e-mails?

In the SPF entry the mechanism 'a' has not been set.

Additionally authorized A-records?

In addition to the A-Records stored in the DNS, we could not find any other records authorized in the SPF-Record.

Are the registered mail servers allowed to send e-mails?

In the SPF entry the mechanism 'mx' has not been set

Additionally authorized MX records

We could not find any other records authorized in the SPF record besides the MX records stored in the DNS

Additionally authorized IPv4 addresses

No explicit IPv4 addresses in the SPF record have been authorised to send

Additionally authorized IPv6 addresses

No explicit IPv6 addresses in the SPF record have been authorised to send

How is the sender informed?

The exp mechanism acts as a return to the sender if the IP address was not authorized to send and notify them. None was found.

PTR (obsolete mechanism)

The ptr mechanism is deprecated, slow and insecure and should not be used

PTR:

The ptr mechanism is deprecated, slow and insecure and should not be used

Authorize IP addresses with markers

When SPF is evaluated, macros can specifically authorize Ip addresses based on the request or connection of the user or client (RFC7208 )

Receiver address

analysis.ra-missing

Amount of reports

analysis.rp-missing

Report selection

analysis.rr-missing

Unknown mechanisms

No unknown mechanisms were found in the SPF record.

Recently performed SPF lookups

Server IP Address

We have determined the following IP address for the domain:

No domain specified

Reverse address

We have determined the following name for the server IP address:

192.0.66.108

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