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Total

DNS

Email

Security

Network

100

Availability

Domaintue.nl

IPv41

IPv60

MX records1

StatusActive

Domain technical report

503 Backend fetch failed

tue.nl

Generated: 2026-08-09T00:54:46-05:00 · Cached result

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IPv41

IPv60

MX1

NS2

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

2 NS record(s); 2 or more required.

✓

SOA record10 / 10 pts · Dns

Authoritative zone record.

✓

DNSSEC chain15 / 15 pts · Dns

DS and DNSKEY detected.

CAA policy0 / 5 pts · Dns

Certificate authority restriction.

✓

DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

1 MX record(s).

✓

SPF25 / 25 pts · Mail

SPF policy published.

✓

DMARC25 / 25 pts · Mail

DMARC policy published.

✓

DKIM20 / 20 pts · Mail

A DKIM selector was verified.

MTA-STS0 / 5 pts · Mail

Mail transport policy.

TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓

Valid TLS certificate55 / 55 pts · Security

68 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers16 / 35 pts · Security

4 of 9 evaluated headers detected.

✓

PTR reverse DNS30 / 30 pts · Network

PTR: fwb-3000f-vip-01.icts.tue.nl

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/2 200

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)

131.155.10.135

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

1 record(s)

10 tue-nl.mail.protection.outlook.com.

TXT

16 record(s)

"P.O. Box 513, 5600 MB Eindhoven, The Netherlands"
"miro-verification=cb1958a2546dab9752639eeb5a07b1cf02ec18a8"
"MS=58573ACBE8201AC4B395EF00A745C38DB1DD57FA"
"v=spf1 ip4:167.89.63.218 ip4:185.138.80.117 include:spfdefault.mail.tue.nl include:spf.topdesk.net include:smtpeter.com include:spf.interconnect.nl include:carerix.net a:outmail.hireserve.nl -all"
"adobe-idp-site-verification=8d48631e0b4d87e4d1c6f0d04bc8c5b8106bfcdb3cfad0f0a2be59ae8f67f80f"
"globalsign-domain-verification=1F7EC979113CCDF8F244158D6DFF7947"
"mentimeter-aa1b69ac-305e-466e-bcd6-aec5639817c2"
"facebook-domain-verification=eyg9tk0dlzfngb7spof8kirgsjye06"
"atlassian-domain-verification=EATjeWp2TWSpBt8CIt5ngmWgUCL58gs8ZYa9LUdUS4IiMHmeJiiYEVTwYH8f07vJ"
"anthropic-domain-verification-mdd659=5GXFiqI1LUZ2Qx559qlWCEU4x"
"Eindhoven University of Technology"
"autodesk-domain-verification=p53xRNeOV9HPWzWd2l2t"
"HARICA-dzf3wGHrp8YxKUnknJg"
"google-site-verification=WwQlrCFBbFYz9HaIZTCskfrONfrROlnfabGixoqwyS0"
"google-site-verification=uNp_IVRt-7BLrpDzH925tElqmPLaeMVrFBV-MTNizv4"
"mgverify=870f2f8187f4d172141d9f194ca8e343f25a36b8ebe3474e711a9d0e6eba4deb"

NS

2 record(s)

ns02.tue.nl.
ns01.tue.nl.

SOA

1 record(s)

ipam.tue.nl. hostmaster.tue.nl. 61229 10800 3600 2419200 900

CAA

0 record(s)

—

Not configured

DS

1 record(s)

16415 8 2 75AA3F38B547BDC332F62485A0284820F0B554141B738DBFD5DED2B4 AE7DB4F4

DNSKEY

4 record(s)

256 3 8 AwEAAbixMaYA92QulNG//wrZu3T/A/vmsAJJ6VhqbILNaJ4BwuW9jLyh Hgwt6RKALugoJIYDraX2i12Ajr0Tq8fLaJc9JGbxL3tN/KHroEy8rWiC vgRaj1I28Wk70SpOLqO1lIwKkXJUSfIstpdTU/6EiS3XiNvUK3FbERqq imhYE2MN
257 3 8 AwEAAakc+frFZRAhv62CeAibQ1KhKeMaBK20TZGQX268NlYGGCH0tnOt /UZCxNPWP+BXzHeHZ1bM+Gj6TlGQTGvvWnEtBSjoZtAGEzvCW08qW6uZ 5te+ey71uBqqQbCnBj4NuAxXi4Mnac4ae7WtfrO1hcpAGtYbDh53SAek 0gCJdH8uQj5/mT9I+RoEj1EySTy8ZpxTq8hnnwUMnlRrsEwlVNAH0sK1 YQx2NtLhgPqYbU5XVtvuqLCZ0JB0ISeKWXM3PKyqqH80J8tYif2+7DK9 xk01aD1YIOqkYXDD9NrhczxA+PWfm9YrNV7fJGNgdWcGtcS+6LEXi0m1 9ss09QK02ec=
257 3 8 AwEAAZNzFxBgLUD6wwzxtCuVNNBC9Q2q/vJjRthg1hwFwYzjq5nsvNh1 0HzoqS6PGkMTUhFd8JxeTbtmG7atynwIwUel8gcb2Kx4AhING5sP3VPQ X6kZ7G0CrqYIgC11L7oFd+nzLxpwKTLlwLPCYkjfVcGfGd0PsHMaj+zA 2IYUZpKeTiKO1U2Aa+tBml28byOlK22plmz5M6Y2pfnXI7UuozNYy+uK yswIzlAG4Cya6HIyjnNO8RoxeMvU7DI5oxW15pDzh+PBNZJ4SnNCAZ2e HcCFEa7p6ZYOJUbQtkHc7zxamII9R0weBFBCm61dPwJv/FeQDs1wjU61 hDivNmG0u78=
256 3 8 AwEAAaOW30rKY/7D8EKlA0BZzPhEcyUDcCDRW83wj8v0ry6pzj0v5ZWW 2C17UqWXAN1HYObZnlR6exwGUv3UkMBeJaJ1jqU+kqijlQdb4RVCom+D jBGuR1Zgkud9k/AjOi3pQV+ns02gqkxINHmLSBkMZUA1/VgixTdMKT88 8p21HAfp

RRSIG

3 record(s)

A 8 2 86400 20260812213406 20260808204255 36034 tue.nl. KuaBh6wXjI0vY2fNY3/RGVKXEd8RbxkJ1TpajYrfhud67ggKbBewv5kB +uScJSdHPTGUVleN5V4idtKMmoZeaXjdQY40vIdyLXXBXMJUG4g9EHHg U5gSeTC96CUs5xJ/SliP3nJzpRq3hRoH203sGU4cF69zgK7KKgvSZTj5 UvU=
DS 13 2 3600 20260823213926 20260726203801 467 nl. j7TFmp+Hnxjsdsbc5UBHXYfXTI81YKv2aBn3LvBsrlWXXpsfghRrMQdz Ogzjsw25Tn8JF9IjtCgYmZH8uPsBjw==
MX 8 2 86400 20260812235146 20260808233200 36034 tue.nl. ZIuIhUY3LD+EVM6ZiM+cFUwqsUk5z5Jz8KnUasszwgR52wmAYII0u2Bl jPcdNn6zL9eTgEZch9LyeiQeQ5lqRt7XKB+A/l94+3TjWXzYzxp9kIzh D/XPfdlUNNs6pGGA4evE5TxuMyJxkZyxegf6KunmhqaNsKRZ9aPBFPzF kE0=

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

Configured

v=spf1 ip4:167.89.63.218 ip4:185.138.80.117 include:spfdefault.mail.tue.nl include:spf.topdesk.net include:smtpeter.com include:spf.interconnect.nl include:carerix.net a:outmail.hireserve.nl -all

DMARC

Configured

v=DMARC1; p=reject; sp=reject; rua=mailto:dmarc@xw3qj0xq.uriports.com; fo=1:d:s

DKIM

Selector selector1

v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCz+KSPuwS7fAjd6je/q8s5/y0Vk8uxjV+XH6iulXK4Tjb7Eiq6V0nt8+uBxXNwo3FzrvscAZdCaBFwjUy63l7V0xFBDFhvFfOJiomUunCPWapq5xafHUUf/htNEJ6M4cCEZXQhb7YGk7AvjsjD2hcC4ZjgF1FGnxc263+vAAZPxwIDAQAB; n=1024,1449173613,1464984813

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

503 Backend fetch failed

Description

Final URL

https://www.tue.nl/en/

HTTP status

503

HTTP

Status

HTTP/2 200

Final URL

https://www.tue.nl/en/

Version

Server

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Let's Encrypt

tue.nl

Valid from

2026-07-18T09:00:38-05:00

Valid until

2026-10-16T09:00:37-05:00

Days remaining

Protocol

TLSv1.3

Cipher

TLS_AES_256_GCM_SHA384

Security headers

4 active

✓

HSTSImplemented

—

Content Security PolicyNot detected

✓

X-Content-Type-OptionsImplemented

✓

X-Frame-OptionsImplemented

✓

Referrer PolicyImplemented

—

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

Consistent

✓

Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

131.155.10.135

61,34 ms

Cloudflare

1.1.1.1

131.155.10.135

517,62 ms

Quad9

9.9.9.9

131.155.10.135

148,69 ms

OpenDNS

208.67.222.222

131.155.10.135

143,82 ms

AdGuard

94.140.14.14

131.155.10.135

67,27 ms

IP, geolocation and ASNAssociated network information

131.155.10.135

No data

success

country

region

city

asn

organization

isp

Visitor information

Visitor

216.73.217.62

reverse

country

country_code

region

city

latitude

longitude

isp

organization

asn

timezone

browser

Other

language

user_agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

is_bot

Yes

cloudflare

SMTPEmail port connectivity

tue-nl.mail.protection.outlook.com

Port 25: Closed/unreachable - 36.4 ms - 
Port 465: Closed/unreachable - 4026.1 ms - 
Port 587: Closed/unreachable - 4005.2 ms -

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