SPF Check:
gweb.de

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
Lookup for the domain:
gweb.de
IP address to be checked:
no IP address specified
  •   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 gweb.de.
The SPF record for gweb.de 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, 65 IP address(es) were authorized by the SPF record to send emails.

The SPF record analysis was performed on 06.12.2022 at 14:23:03 clock.

Complete check for email deliverability & security
SPF is just one aspect among many.
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Complete check for email deliverability & security

Evaluation for the domain gweb.de 

Nameserverset:
ns.giordano-online.net
ns2.giordano-online.net
ns3.giordano-online.net
Determined SPF record:
Legitimated IP addresses:
IP Provider / ASN DNSBL-Check
51.15.19.27 Online S.a.s. blacklist 
104.47.51.138 MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
104.47.30.74 MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
51.15.223.178 Online S.a.s. blacklist 
92.204.39.0/24
Host Europe GmbH blacklist 
92.204.37.0/24
Host Europe GmbH blacklist 
92.204.43.0/24
Host Europe GmbH blacklist 
80.67.16.0/20
Host Europe GmbH blacklist 
77.91.232.0/21
Host Europe GmbH blacklist 
62.67.200.0/24
LEVEL3 blacklist 
93.187.232.0/21
Host Europe GmbH blacklist 
188.93.8.0/21
Host Europe GmbH blacklist 
185.21.100.0/22
Host Europe GmbH blacklist 
93.180.152.0/21
Host Europe GmbH blacklist 
37.200.96.0/21
Host Europe GmbH blacklist 
176.221.40.0/21
Host Europe GmbH blacklist 
141.0.16.0/21
Host Europe GmbH blacklist 
46.252.16.0/20
Host Europe GmbH blacklist 
109.239.48.0/20
Host Europe GmbH blacklist 
134.119.228.0/24
Host Europe GmbH blacklist 
134.119.0.0/17
Host Europe GmbH blacklist 
134.119.128.0/19
Host Europe GmbH blacklist 
134.119.160.0/20
Host Europe GmbH blacklist 
134.119.224.0/19
Host Europe GmbH blacklist 
92.204.33.0/24
Host Europe GmbH blacklist 
92.204.55.0/24
Host Europe GmbH blacklist 
92.204.58.0/24
Host Europe GmbH blacklist 
134.119.0.0/24
Host Europe GmbH blacklist 
92.204.236.0/24
Host Europe GmbH blacklist 
92.204.239.0/24
Host Europe GmbH blacklist 
2001:1520:a:0:0:0:0:0/56
Host Europe GmbH blacklist 
2a00:1158:0:300::/56
Host Europe GmbH blacklist 
2a00:1158:400:1::/120
Host Europe GmbH blacklist 
2a00:1158:5::/48
Host Europe GmbH blacklist 
92.205.64.0/24
Host Europe GmbH blacklist 
2a00:1158:0005:0800:0000:0000:0000:0000/56
Host Europe GmbH blacklist 
2a00:1158:5:900::/56
Host Europe GmbH blacklist 
188.94.249.240/28
Mittwald CM Service GmbH & Co. KG blacklist 
188.94.250.248/29
Mittwald CM Service GmbH & Co. KG blacklist 
188.94.251.248/29
Mittwald CM Service GmbH & Co. KG blacklist 
188.94.252.252/30
Mittwald CM Service GmbH & Co. KG blacklist 
185.15.192.32/27
Mittwald CM Service GmbH & Co. KG blacklist 
178.16.56.32/27
Mittwald CM Service GmbH & Co. KG blacklist 
185.15.192.32/28
Mittwald CM Service GmbH & Co. KG blacklist 
153.92.196.160/28
Mittwald CM Service GmbH & Co. KG blacklist 
37.202.1.52/30
Mittwald CM Service GmbH & Co. KG blacklist 
37.202.6.52/30
Mittwald CM Service GmbH & Co. KG blacklist 
40.92.0.0/15
MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
40.107.0.0/16
MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
52.100.0.0/14
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::/50
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 
51.4.72.0/24
- blacklist 
51.5.72.0/24
- blacklist 
51.5.80.0/27
- blacklist 
20.47.149.138/32
MICROSOFT-CORP-MSN-AS-BLOCK blacklist 
51.4.80.0/27
- blacklist 
2a01:4180:4051:0800::/64
- blacklist 
2a01:4180:4050:0800::/64
- blacklist 
2a01:4180:4051:0400::/64
- blacklist 
2a01:4180:4050:0400::/64
- blacklist 
SPF-Syntax Check:
Analysis result of the SPF record for the domain: gweb.de

SPF record available?

We found an SPF record for the domain.

v=spf1

Are the server addresses allowed to send e-mails?

The mechanism 'a' was set in the SPF record. The following IP addresses are allowed to send

51.15.19.27

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

The mechanism 'mx' was set in the SPF entry. The following hosts are allowed to send

gweb-de.mail.protection.outlook.com
gweb-de.mail.protection.outlook.com

Additionally authorized IPv4 addresses

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

51.15.223.178

Additional external SPF records

We could find other records authorized in the SPF record

include:ispgateway.de
v=spf1 ip4:92.204.39.0/24 ip4:92.204.37.0/24 ip4:92.204.43.0/24 ip4:80.67.16.0/20 ip4:77.91.232.0/21 ip4:62.67.200.0/24 ip4:93.187.232.0/21 ip4:188.93.8.0/21 ip4:185.21.100.0/22 ip4:93.180.152.0/21 ip4:37.200.96.0/21 ip4:176.221.40.0/21 ip4:141.0.16.0/21 ip4:46.252.16.0/20 ip4:109.239.48.0/20 ip4:134.119.228.0/24 ip4:134.119.0.0/17 ip4:134.119.128.0/19 ip4:134.119.160.0/20 ip4:134.119.224.0/19 ip4:92.204.33.0/24 ip4:92.204.55.0/24 ip4:92.204.58.0/24 ip4:134.119.0.0/24 ip4:92.204.236.0/24 ip4:92.204.239.0/24 ip6:2001:1520:a:0:0:0:0:0/56 ip6:2a00:1158:0:300::/56 ip6:2a00:1158:400:1::/120 ip6:2a00:1158:5::/48 ip4:92.205.64.0/24 ip6:2a00:1158:0005:0800:0000:0000:0000:0000/56 ip6:2a00:1158:5:900::/56 ~all
ipv4:
92.204.39.0/24
ipv4:
92.204.37.0/24
ipv4:
92.204.43.0/24
ipv4:
80.67.16.0/20
ipv4:
77.91.232.0/21
ipv4:
62.67.200.0/24
ipv4:
93.187.232.0/21
ipv4:
188.93.8.0/21
ipv4:
185.21.100.0/22
ipv4:
93.180.152.0/21
ipv4:
37.200.96.0/21
ipv4:
176.221.40.0/21
ipv4:
141.0.16.0/21
ipv4:
46.252.16.0/20
ipv4:
109.239.48.0/20
ipv4:
134.119.228.0/24
ipv4:
134.119.0.0/17
ipv4:
134.119.128.0/19
ipv4:
134.119.160.0/20
ipv4:
134.119.224.0/19
ipv4:
92.204.33.0/24
ipv4:
92.204.55.0/24
ipv4:
92.204.58.0/24
ipv4:
134.119.0.0/24
ipv4:
92.204.236.0/24
ipv4:
92.204.239.0/24
ipv4:
92.205.64.0/24
ipv6:
2001:1520:a:0:0:0:0:0/56
ipv6:
2a00:1158:0:300::/56
ipv6:
2a00:1158:400:1::/120
ipv6:
2a00:1158:5::/48
ipv6:
2a00:1158:0005:0800:0000:0000:0000:0000/56
ipv6:
2a00:1158:5:900::/56
include:agenturserver.de
v=spf1 ip4:188.94.249.240/28 ip4:188.94.250.248/29 ip4:188.94.251.248/29 ip4:188.94.252.252/30 ip4:185.15.192.32/27 ip4:178.16.56.32/27 ip4:185.15.192.32/28 ip4:153.92.196.160/28 ip4:37.202.1.52/30 ip4:37.202.6.52/30 ~all
ipv4:
188.94.249.240/28
ipv4:
188.94.250.248/29
ipv4:
188.94.251.248/29
ipv4:
188.94.252.252/30
ipv4:
185.15.192.32/27
ipv4:
178.16.56.32/27
ipv4:
185.15.192.32/28
ipv4:
153.92.196.160/28
ipv4:
37.202.1.52/30
ipv4:
37.202.6.52/30
include:spf.protection.outlook.com
v=spf1 ip4:40.92.0.0/15 ip4:40.107.0.0/16 ip4:52.100.0.0/14 ip4:104.47.0.0/17 ip6:2a01:111:f400::/48 ip6:2a01:111:f403::/49 ip6:2a01:111:f403:8000::/50 ip6:2a01:111:f403:c000::/51 ip6:2a01:111:f403:f000::/52 include:spfd.protection.outlook.com -all
ipv4:
40.92.0.0/15
ipv4:
40.107.0.0/16
ipv4:
52.100.0.0/14
ipv4:
104.47.0.0/17
ipv6:
2a01:111:f400::/48
ipv6:
2a01:111:f403::/49
ipv6:
2a01:111:f403:8000::/50
ipv6:
2a01:111:f403:c000::/51
ipv6:
2a01:111:f403:f000::/52
include:spfd.protection.outlook.com
v=spf1 ip4:51.4.72.0/24 ip4:51.5.72.0/24 ip4:51.5.80.0/27 ip4:20.47.149.138/32 ip4:51.4.80.0/27 ip6:2a01:4180:4051:0800::/64 ip6:2a01:4180:4050:0800::/64 ip6:2a01:4180:4051:0400::/64 ip6:2a01:4180:4050:0400::/64 -all
ipv4:
51.4.72.0/24
ipv4:
51.5.72.0/24
ipv4:
51.5.80.0/27
ipv4:
20.47.149.138/32
ipv4:
51.4.80.0/27
ipv6:
2a01:4180:4051:0800::/64
ipv6:
2a01:4180:4050:0800::/64
ipv6:
2a01:4180:4051:0400::/64
ipv6:
2a01:4180:4050:0400::/64

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

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.

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:

thor.gweb.de

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