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Total

DNS

Email

Security

Network

Availability

Domainnctu.edu.tw

IPv40

IPv60

MX records2

StatusActive

Domain technical report

nctu.edu.tw

Generated: 2026-08-10T11:44:05-05:00 · Cached result

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IPv40

IPv60

MX2

NS2

DiagnosticsMain findings and recommendations

IPv4 (A)0 / 30 pts · Dns

0 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 propagation0 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

2 MX record(s).

✓

SPF25 / 25 pts · Mail

SPF policy published.

DMARC0 / 25 pts · Mail

DMARC policy not found.

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 certificate0 / 55 pts · Security

No valid certificate was retrieved.

Certificate lifetime0 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers0 / 35 pts · Security

0 of 9 evaluated headers detected.

PTR reverse DNS0 / 30 pts · Network

PTR not detected.

IPv4 diversity0 / 35 pts · Network

Two or more IPv4 addresses receive full points.

IPv6 connectivity0 / 35 pts · Network

AAAA availability.

DNS resolution0 / 40 pts · Availability

At least one address family must resolve.

HTTP response0 / 40 pts · Availability

No successful HTTP response.

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

0 record(s)

—

Not configured

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

2 record(s)

0 gw1-mail.nctu.edu.tw.
10 gw2-mail.nctu.edu.tw.

TXT

3 record(s)

"google-site-verification=Yb3SUzjOJHmkovbjHEg6tvJBxt4LWBJxoFCQ0-Fnk8Y"
"v=spf1 ip4:140.113.2.64/26 ip4:211.76.241.6 ip4:140.113.98.162 ip4:140.113.98.175 ip4:140.113.9.141 include:_spf.google.com ~all"
"sIjAnVFk4y2u8l0PKKMck8GfeOW7uRJgQqJbmmg3Uxc"

NS

2 record(s)

ns2.nycu.edu.tw.
ns1.nycu.edu.tw.

SOA

1 record(s)

ns1.nycu.edu.tw. hostmaster.ncyu.edu.tw. 2026080403 10800 3600 604800 3600

CAA

0 record(s)

—

Not configured

DS

2 record(s)

61246 13 2 A95E780157A4CE625203AE505D7F1DAE1F1F2568C2C8D1E1272109B5 E4349FDF
61246 13 1 06742D961BD6B739276060778136E7DAA739E494

DNSKEY

1 record(s)

257 3 13 0mkhuSUnHTNPKK6zyiNowlu1yU4Ega1OClyUKbb2H+Xqlj1lzmLy1xhJ hPKbffAAf1YFJvY5I3/KnxSGchk2Vg==

RRSIG

4 record(s)

DNSKEY 13 3 3600 20260820000000 20260730000000 61246 nctu.edu.tw. AMa70gh+RRxchRlhFK4o9PZAJJHm3dXX7vapOBaack2y7WVP9ZkswwDz kfIJc8ideqqEiY6BDgowibKBdse0wQ==
DS 8 3 300 20260814104849 20260810102243 52491 edu.tw. O9s0cYuGOsavXfHGT/MmtHji2V3j/k3aJt0uCbVgcuKrtKTDfgPHq5dv zKF/y1E6xx/dHzcLId9x82KA21zL5GsDg0SuBHT32QytEjPhcx2Klq0B M/H/mPyJluzzZOsMNBV47U877Zrt0CqcDzpzvf0PIM1TgnirmJmTw9jL mKU=
NS 13 3 604800 20260820000000 20260730000000 61246 nctu.edu.tw. oB6Geq9Bl7MjhVzZ8zymWcbn65BL15h4wxqm2+6d9Rt6tOV5ZnmWKOLT L7xYKN9RLXRMirpA8EXQM7nBRXrKGg==
MX 13 3 604800 20260820000000 20260730000000 61246 nctu.edu.tw. Gq8kav6vna7Ny5HVeqZYI+m3BFzCKf+Hs2iu5IQ4a2pQQB36tKBY9Pw2 tWPpQhoU2MRydwpR1+Dpo3Ad9sX/Nw==

NSEC

1 record(s)

aa.nctu.edu.tw. NS SOA MX TXT RRSIG NSEC DNSKEY

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 ip4:140.113.2.64/26 ip4:211.76.241.6 ip4:140.113.98.162 ip4:140.113.98.175 ip4:140.113.9.141 include:_spf.google.com ~all

DMARC

Not configured

—

Not configured

DKIM

Not found

—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

No data

Title

Description

Final URL

https://nctu.edu.tw/

HTTP status

HTTP

Status

Final URL

https://nctu.edu.tw/

Version

Server

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Unavailable

Available

Issuer

Valid from

Valid until

Days remaining

Protocol

Cipher

Security headers

0 active

—

HSTSNot detected

—

Content Security PolicyNot detected

—

X-Content-Type-OptionsNot detected

—

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

Review

Differences detected

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

598,29 ms

Cloudflare

1.1.1.1

1.121,90 ms

Quad9

9.9.9.9

578,75 ms

OpenDNS

208.67.222.222

1.626,29 ms

AdGuard

94.140.14.14

1.476,50 ms

IP, geolocation and ASNAssociated network information

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

gw1-mail.nctu.edu.tw

Port 25: Closed/unreachable - 199.9 ms - 
Port 465: Closed/unreachable - 4216.7 ms - 
Port 587: Closed/unreachable - 4016.2 ms -

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