SPF Check:
knorr-bremse.com

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 knorr-bremse.com.
The SPF record for knorr-bremse.com 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, 53 IP address(es) were authorized by the SPF record to send emails.

The SPF record analysis was performed on 16.03.2025 at 03:42:04 clock.

Lookup for the domain:
knorr-bremse.com
IP address to be checked:
no IP address specified
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Evaluation for the domain knorr-bremse.com 

Nameserverset:
ns2.lemarit.net
ns1.lemarit.de
ns2.lemarit.de
ns1.lemarit.net
ns3.lemarit.de
Determined SPF record:
Legitimated IP addresses:
IP Provider / ASN DNSBL-Check
52.59.111.152 AMAZON-02 blacklist 
149.244.251.90 Knorr-Bremse AG blacklist 
20.31.78.142 MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
20.31.78.205 MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
194.116.128.11 Digital Frankfurt GmbH blacklist 
193.104.82.0/24
Telekom Austria blacklist 
195.201.8.166 Hetzner Online GmbH blacklist 
194.187.94.70 CANCOM Austria AG 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 
169.145.39.240/29
SAP-DC-NS blacklist 
12.129.35.0/27
ATT-INTERNET4 blacklist 
94.199.92.0/23
retarus GmbH blacklist 
103.196.252.0/23
retarus GmbH blacklist 
185.93.140.0/22
retarus GmbH blacklist 
185.215.216.0/22
retarus GmbH blacklist 
207.126.136.0/22
retarus GmbH blacklist 
199.204.12.0/22
retarus GmbH blacklist 
2a02:7b01:0:42::1:0/114
retarus GmbH blacklist 
2a02:7b01:1000:42::1:0/114
retarus GmbH blacklist 
2a02:7b01:2000:42::1:0/114
retarus GmbH blacklist 
2a02:7b02:2000:42::1:0/114
retarus GmbH blacklist 
2a02:7b02:0:42::1:0/114
retarus GmbH blacklist 
2a02:7b03:0:42::1:0/114
retarus GmbH blacklist 
13.69.143.169 MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
20.199.118.217 MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
20.223.216.143 MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
51.103.125.121 MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
52.164.187.230 MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
4.233.75.117 MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
217.196.144.115 conova communications GmbH blacklist 
193.104.18.70 Bremen Briteline GmbH blacklist 
91.249.177.35 EWE-Tel GmbH blacklist 
89.45.227.221 Cleura AB blacklist 
89.45.227.195 Cleura AB blacklist 
86.107.243.139 Cleura AB blacklist 
93.190.66.1/24
dogado GmbH blacklist 
185.175.85.14 Fortion Networks, s.r.o. blacklist 
195.226.191.48/29
1&1 Versatel Deutschland GmbH blacklist 
85.25.89.5 PlusServer GmbH blacklist 
94.199.90.106 retarus GmbH blacklist 
94.199.90.107 retarus GmbH blacklist 
94.199.92.73 retarus GmbH blacklist 
185.93.140.39 retarus GmbH blacklist 
SPF-Syntax Check:
Analysis result of the SPF record for the domain: knorr-bremse.com

SPF record available?

We found an SPF record for the domain.

v=spf1

Additionally authorized IPv4 addresses

Explicit IPv4 addresses in the SPF record have been authorized to send

217.196.144.115
193.104.18.70
91.249.177.35
89.45.227.221
89.45.227.195
86.107.243.139
93.190.66.1/24
185.175.85.14
195.226.191.48/29
85.25.89.5
94.199.90.106
94.199.90.107
94.199.92.73
185.93.140.39

Additional external SPF records

We could find other records authorized in the SPF record

include:spf.knorr-bremse.com
v=spf1 ip4:52.59.111.152 ip4:149.244.251.90 ip4:20.31.78.142 ip4:20.31.78.205 ip4:194.116.128.11 ip4:193.104.82.0/24 ip4:195.201.8.166 ip4:194.187.94.70 include:spf.protection.outlook.com include:_spf.concurcompleat.com include:_spf.general.transactional-mail-a.com
ipv4:
52.59.111.152
ipv4:
149.244.251.90
ipv4:
20.31.78.142
ipv4:
20.31.78.205
ipv4:
194.116.128.11
ipv4:
193.104.82.0/24
ipv4:
195.201.8.166
ipv4:
194.187.94.70
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
include:_spf.concurcompleat.com
v=spf1 ip4:169.145.39.240/29 ip4:12.129.35.0/27 ~all
ipv4:
169.145.39.240/29
ipv4:
12.129.35.0/27
include:_spf.general.transactional-mail-a.com
v=spf1 ip4:94.199.92.0/23 ip4:103.196.252.0/23 ip4:185.93.140.0/22 ip4:185.215.216.0/22 ip4:207.126.136.0/22 ip4:199.204.12.0/22 ip6:2a02:7b01:0:42::1:0/114 ip6:2a02:7b01:1000:42::1:0/114 ip6:2a02:7b01:2000:42::1:0/114 ip6:2a02:7b02:2000:42::1:0/114 ip6:2a02:7b02:0:42::1:0/114 ip6:2a02:7b03:0:42::1:0/114 ~all
ipv4:
94.199.92.0/23
ipv4:
103.196.252.0/23
ipv4:
185.93.140.0/22
ipv4:
185.215.216.0/22
ipv4:
207.126.136.0/22
ipv4:
199.204.12.0/22
ipv6:
2a02:7b01:0:42::1:0/114
ipv6:
2a02:7b01:1000:42::1:0/114
ipv6:
2a02:7b01:2000:42::1:0/114
ipv6:
2a02:7b02:2000:42::1:0/114
ipv6:
2a02:7b02:0:42::1:0/114
ipv6:
2a02:7b03:0:42::1:0/114
include:spf.eu.odmad.quest-on-demand.com
v=spf1 ip4:13.69.143.169 ip4:20.199.118.217 ip4:20.223.216.143 ip4:51.103.125.121 ip4:52.164.187.230 ip4:4.233.75.117 ~all
ipv4:
13.69.143.169
ipv4:
20.199.118.217
ipv4:
20.223.216.143
ipv4:
51.103.125.121
ipv4:
52.164.187.230
ipv4:
4.233.75.117

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 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:

fwd1-prod.lemarit.net

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