Domain technical report
HHU
uni-duesseldorf.de
Die Heinrich-Heine-Universität Düsseldorf ist eine der jüngeren Hochschulen des Landes NRW – gegründet 1965. Seit 1988 trägt die Universität den Namen des großen Sohnes der Stadt.
IPv41
IPv60
MX3
NS5
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75
Total
75
DNS
70
Email
69
Security
50
Network
100
Availability
Domainuni-duesseldorf.de
IPv41
IPv60
MX records3
StatusActive
DiagnosticsMain findings and recommendations
IPv4 (A)30 / 30 pts · Dns
1 IPv4 address(es) detected.
IPv6 (AAAA)0 / 10 pts · Dns
0 IPv6 address(es) detected.
Name server redundancy20 / 20 pts · Dns
5 NS record(s); 2 or more required.
SOA record10 / 10 pts · Dns
Authoritative zone record.
DNSSEC chain0 / 15 pts · Dns
Both DS and DNSKEY are required.
CAA policy5 / 5 pts · Dns
Certificate authority restriction.
DNS propagation10 / 10 pts · Dns
Agreement between public resolvers.
MX records20 / 20 pts · Mail
3 MX record(s).
SPF25 / 25 pts · Mail
SPF policy published.
DMARC25 / 25 pts · Mail
DMARC policy published.
DKIM0 / 20 pts · Mail
No tested DKIM selector responded.
MTA-STS0 / 5 pts · Mail
Mail transport policy.
TLS-RPT0 / 5 pts · Mail
TLS reporting policy.
Valid TLS certificate55 / 55 pts · Security
164 day(s) remaining.
Certificate lifetime10 / 10 pts · Security
Full points require at least 30 days remaining.
HTTP security headers4 / 35 pts · Security
1 of 9 evaluated headers detected.
PTR reverse DNS30 / 30 pts · Network
PTR: www.hhu.de
IPv4 diversity20 / 35 pts · Network
Two or more IPv4 addresses receive full points.
IPv6 connectivity0 / 35 pts · Network
AAAA availability.
DNS resolution40 / 40 pts · Availability
At least one address family must resolve.
HTTP response40 / 40 pts · Availability
HTTP/1.1 200 OK
HTTPS final URL20 / 20 pts · Availability
Final URL uses HTTPS.
DNS and emailPublished records and email configuration
A
1 record(s)134.99.128.238
AAAA
0 record(s)—
Not configured
CNAME
0 record(s)—
Not configured
MX
3 record(s)10 b2881.mx.srv.dfn.de. 10 a2881.mx.srv.dfn.de. 10 c2881.mx.srv.dfn.de.
TXT
8 record(s)"security_policy=https://www.hhu.de/it-sicherheit" "adobe-idpfzim.-site-verification=18ec973e322894c7c0c11b75d7434eb7c4a5b8d2f164b30a6d47f928c7b5f811" "v=spf1 ip4:134.99.18.0/24 ip4:134.99.128.0/24 ip4:134.99.108.0/27 ip4:134.99.108.128/27 include:spf.qb-feedback.com include:_spf.o288.mx.srv.dfn.de -all" "HARICA-bCYMh0SDGtswzHtocY7" "google-site-verification=DXljWnX7rdU4M0eVZpbohHsXbc8q8VEP4GdNoPwL5yE" "Q181-R920-S212" "security_contact=cert@hhu.de" "cisco-ci-domain-verification=4a60e9dddacd024a7029731869b6259bfb32e550f5004eb699afadf7d558cbf"
NS
5 record(s)dns-3.dfn.de. selene.rz.uni-duesseldorf.de. sirene.rz.uni-duesseldorf.de. dns-1.dfn.de. dns-2.dfn.de.
SOA
1 record(s)sirene.rz.uni-duesseldorf.de. hostmaster.uni-duesseldorf.de. 2026080701 3600 600 1814400 3600
CAA
6 record(s)0 issue "harica.gr" 0 iodef "mailto:cert@hhu.de" 0 issuewild "harica.gr" 0 issue "pki.dfn.de" 0 issue "telesec.de" 0 issue "sectigo.com"
DS
0 record(s)—
Not configured
DNSKEY
0 record(s)—
Not configured
RRSIG
0 record(s)—
Not configured
NSEC
0 record(s)—
Not configured
NSEC3
0 record(s)—
Not configured
SRV
0 record(s)—
Not configured
NAPTR
0 record(s)—
Not configured
TLSA
0 record(s)—
Not configured
SSHFP
0 record(s)—
Not configured
SPF
Configuredv=spf1 ip4:134.99.18.0/24 ip4:134.99.128.0/24 ip4:134.99.108.0/27 ip4:134.99.108.128/27 include:spf.qb-feedback.com include:_spf.o288.mx.srv.dfn.de -all
DMARC
Configuredv=DMARC1;p=none;sp=quarantine;pct=100;rua=mailto:dmarc-reports@uni-duesseldorf.de;ruf=mailto:dmarc-reports@uni-duesseldorf.de;aspf=r
DKIM
Not found—
Not configured
Analyzed webpageMetadata and HTTP response
Title and description
ExtractedTitle
HHU
Description
Die Heinrich-Heine-Universität Düsseldorf ist eine der jüngeren Hochschulen des Landes NRW – gegründet 1965. Seit 1988 trägt die Universität den Namen des großen Sohnes der Stadt.
Final URL
https://www.hhu.de/
HTTP status
206
HTTP
Status
HTTP/1.1 200 OK
Final URL
https://www.hhu.de/
Version
2
Server
Apache
X-Powered-By
SSL and HTTP securityCertificate, protocol and security headers
SSL certificate
AvailableAvailable
Yes
Issuer
Hellenic Academic and Research Institutions CA
CN
hhu.de
Valid from
2026-01-21T09:58:58-06:00
Valid until
2027-01-21T09:58:58-06:00
Days remaining
164
Protocol
TLSv1.2
Cipher
ECDHE-ECDSA-AES128-GCM-SHA256
Security headers
1 activeHSTSNot detected
Content Security PolicyNot detected
X-Content-Type-OptionsImplemented
X-Frame-OptionsNot detected
Referrer PolicyNot detected
Permissions PolicyNot detected
Cross-Origin-Opener-PolicyNot detected
Cross-Origin-Embedder-PolicyNot detected
Cross-Origin-Resource-PolicyNot detected
DNS propagationComparison across public resolvers
Public resolver comparison
ConsistentConsistent propagation
5 public resolvers queried.
ResolverServerResultLatency
Google
8.8.8.8134.99.128.238
41,02 ms
Cloudflare
1.1.1.1134.99.128.238
244,28 ms
Quad9
9.9.9.9134.99.128.238
284,18 ms
OpenDNS
208.67.222.222134.99.128.238
787,97 ms
AdGuard
94.140.14.14134.99.128.238
47,55 ms
IP, geolocation and ASNAssociated network information
134.99.128.238
No datasuccess
No
country
region
city
asn
organization
isp
Visitor information
Visitorip
216.73.217.62
reverse
country
country_code
region
city
latitude
longitude
isp
organization
asn
timezone
browser
Other
os
Other
language
user_agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
is_bot
Yes
cloudflare
No
SMTPEmail port connectivity
b2881.mx.srv.dfn.de
Port 25: Closed/unreachable - 119.8 ms - Port 465: Closed/unreachable - 4021 ms - Port 587: Closed/unreachable - 4021 ms -