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Total

DNS

Email

Security

Network

100

Availability

Domaina-star.edu.sg

IPv43

IPv60

MX records1

StatusActive

Domain technical report

a-star.edu.sg

Generated: 2026-08-11T05:45:23-05:00 · Cached result

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IPv43

IPv60

MX1

NS3

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

3 IPv4 address(es) detected.

IPv6 (AAAA)0 / 10 pts · Dns

0 IPv6 address(es) detected.

✓

Name server redundancy20 / 20 pts · Dns

3 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 policy5 / 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

142 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: ec2-13-251-180-0.ap-southeast-1.compute.amazonaws.com

✓

IPv4 diversity35 / 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/2 202

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

3 record(s)

13.251.180.0
54.251.88.218
54.151.226.24

AAAA

0 record(s)

—

Not configured

CNAME

5 record(s)

;; communications error to 69.64.44.20#53: timed out
;; communications error to 69.64.44.50#53: timed out
; <<>> DiG 9.18.39-0ubuntu0.22.04.4-Ubuntu <<>> a-star.edu.sg CNAME +short +time=1 +tries=1
;; global options: +cmd
;; no servers could be reached

MX

1 record(s)

0 astar-edu-sg0c.mail.protection.outlook.com.

TXT

12 record(s)

"cu45p2nn9kcb9hs9c1ds34lc98"
"fp327p0heoti4tcuimpkn8fu56"
"successfactors-site-verification=NjkwNTJiMGFlN2ZkMTE1NmMxNDljOTQwMzI1NmNhNDA2ZTU4ZjJkNDYxNzNmNjJjNjk1NTQ0MzU4OTVkZjQwNg=="
"432mqu6ao4neglshgusak9m3t5"
"openai-domain-verification=dv-hF4hJeNX3xMbjXuxPRDJ6mim"
"v=spf1 include:spf.a-star.edu.sg include:spf.protection.outlook.com a:a-star.edu.sg -all"
"8emru3a8p6dqvmnjndmkvnuvvi"
"perplexity-ai-domain-verification-8wnwqp=uOHETfHSp0ykaNbj0LQ8gY0SW"
"google-site-verification=mMQ3MBwp5SMsi7xsEZzDubDB1hSekhg7f5STch55zeo"
"MS=ms39123724"
"47rd0ujhf7q51fdpka1t4av0fh"
"anthropic-domain-verification-nhfbft=xlXdiZhFLWDDC8sy0HsO77yNp"

NS

3 record(s)

ns3.a-star.edu.sg.
ns2.a-star.edu.sg.
ns1.a-star.edu.sg.

SOA

1 record(s)

gm-dns.a-star.edu.sg. please_set_email.absolutely.nowhere. 141638 10800 1080 2592000 900

CAA

1 record(s)

;; communications error to 69.64.44.20#53: timed out

DS

1 record(s)

59659 8 2 C0431AE982E933C85586F7A60CEE9580D1491D87825519CF2E26FF3A 95350E24

DNSKEY

3 record(s)

256 3 8 AwEAAcFxPd8X9n9jCjm5A1CP0X2tO5e12HqJE1rVNxRXW8OU8+XYsydI BvoAMXDIfHb4KE9VDIA46aopSmbEXWzof7FhP34p2BGMoC3amDWs4J0l 9xxJTg6AFWplFR1v6dNofkZsany/NCvxLwKRg+82/IIUkLHMlC7xOnEX QiicuwXH
257 3 8 AwEAAeUROO7OyfuXJdfQYjUQtyReLAqyxfs/Atp7EHMpvYdeI4bShYBM NDHSx2M5CkxuEVaZv47fWC5OqY+0L7HjYwx/DjTmtVtcI8Y8EoMXJOdb +6d6+FiOTamDZLJ/j3aw6o1sPB94KOKQjRS6ytC7rzbcPnwc6bBHRu5b XtVYhmBvzX1o6I1K1GMk8hBcnqycJTb+D6OGuybU5uShCAhkTl8CLVFP zf7XtPl5ZuBKICcWK0YGMoF7ASyhxUOunH5Md/QdYo4AqB7UaCS/U8zY noFKefu0zFSAVxtj2nEGWnweYgyDAcgIaNq8YpVnWsRJv9jdjPTBbgcF qYGolQkOoFE=
256 3 8 AwEAAecwexj8PYIdBy5rYTtb2mX+xspARF/PtDeAM0JGh78iQ8LxCLT8 CPJcJZIruncIX/M3jhErXIkXJt5SBg6ItMfZKb+fh7bzP6m2+Z2dBun7 NIA3VPIf8sJ6gfigp6ULJcXKnp4pp8Sek2hfceE8iQEf3Lg95LZ1G3aP Yf78dJJD

RRSIG

10 record(s)

NS 8 3 28800 20260816021119 20260811014918 26695 a-star.edu.sg. OSmEyayMyr6LH0Mm1ClV7UxwVRO9eT+4GnfZodKpm7J6asmAy/49qGpb QWicDH/Z9E7LdK5Ubx1to8d20ZF1USYUxSWlPWtmjtwPHCX/rI1EKXQr LEzOwPocjq4wUtNp6kOArjRgzqnuQ61UjsuOWXlE/GX+UGica3pjgq1K gJc=
PTR 8 3 300 20260816021119 20260811014918 26695 a-star.edu.sg. GsjN8EBRNCMvsmO8gqz0WGRvHNfiSdruV4DmEKJfAn2dWPWVaGhfBmO3 k7esYbBXI3GMti6x1KnpfAXCOTM+8ry53VuTKcV5/lgaXc46cWMFfFF6 00Wk+94E6RSrxmdR6sNQK9KGHU0P3XtDK2q8UpxnMCpiK38TDKHzJiH9 NlU=
TXT 8 3 3600 20260815103829 20260810101751 26695 a-star.edu.sg. gb0adRoiRVbNroXNKot3eYHv8KpPiOEcYJ/XnqvDq3MQpRjLPQVS8sKA 2l5L8HfGRnAQSuC+81a/2u5f4C8K9OWUH3Op6OcpRao2bzBQ2fI800lJ faWsc7mgVRwVBfKzSCnmTWgrIAOiI0yuhwaTkV/xvBN+0RuiFp0xssfB iJU=
A 8 3 300 20260816082911 20260811082016 26695 a-star.edu.sg. nk5Mi6TwKd1StFInL5cEegwGRmAIysPoh/ueoMfWQgQCmgbyRjO2RyJf 9sTcbaErsGYqWBMclVHSLR087BrG7srYThnmE40uGB4mnIVHI150EHat xZq3T/em445KNs0oMmVJPP4v8Bsy1R3pttZz1pXu7aedEqFsNHbQ8XxV FOQ=
SOA 8 3 28800 20260816104002 20260811094002 26695 a-star.edu.sg. GhSHKD6WTbeXDcG/s0i+efm1bKkHcSsKAKr0y4byPtKTvqGPIwPD37Yy h6iVWQS8jDxcxSwCflVdXly7xTKc/1AttrOuiI3jMe4F1rohaLqz54iQ Wc5YeZPISZO+weFGQax+wlDrkKJAlAjZRzEZo+M23Zj26Z9zN1WAdTv0 PRQ=
DNSKEY 8 3 216000 20260815184323 20260810181110 26695 a-star.edu.sg. qRBKR6HMcxfrDGPANaf7FqHOGG0EOmLTZt5+FLxM4IUaKQwXycjeb643 SGmbDx8wncjKJlnOk8oHX2CKBdEmBzAWLxey9bKo75dFmst3JJeN1hAA 5f86+55dp5LhUhIaaM4Rc6Ei558k9x/4orKhY63tl1x0ZbkdWJ7QG89c QKQ=
DNSKEY 8 3 216000 20260815184323 20260810181110 59659 a-star.edu.sg. rjsx9xx03z7rQmVr9tH9PvUndEp6s/BR0HM0njRzL2d1Rh2AuJ5qSpKN vtPd/h2EIinl+VJWHfTyeWvf9rYbQKvoi8/FjkCG9QG9GrBA5DB3PQhz wTRnWCqzmi3qDQb6wIto6mc0GJyd3TUXYLDfDr4AREhOt+eA4IicV287 O9FSeWgqDr+DqGS38ANB/HqX2JApHM+sFsa7BRDZOsKbvJGVyLUx2351 i/wWJNP5AC1Pz9Ed/qXgYY59MZPH9atl4JjOgMh4mdvnDn9extf0C1VH yxpEwP7mqKnyscp6aFlvWw7wuj5Ag9vN9A7IksGqS4ywsBzI70ak5ztO HcpuGA==
MX 8 3 600 20260816021119 20260811014918 26695 a-star.edu.sg. N2QBK9zornYltj6zUC35QrEykdNKaobiyI7r8rUwrNQTRYmWZmcV1tc9 /ixuaSx2oPCbsnu+3dk2xW0KZjYUEiJAUwYdN3DNxJ00knw7cdPV19b7 5UDwTGzyJXyCDhk2E1U1Ohf3vnhU91NBqQm46+qCdF18of02vD7WyzeA 2Rw=
DS 8 3 3600 20260814170623 20260807130020 48175 edu.sg. DE6sa6Xu0bwbRkqd/Cq8XwnynUhgNsP3VVeOGtxf3TuzwreMAT0BjZXY MU8Z2/FzK1L+fHtjEFUmrHCeOGvotLUl8Uhc3DyZ379CGDFsV95seWgE WfKgeuDMOVlBNPedaZVpulMJP7JLA/fiBa5XqF2VtIBffkB6EQDagfCq nx/g5IycG8z4uG2Ws7kaB3goggbq9UGf+7N1eDZ/IGt6uLkHXhHWJBtz WdidvXUmSlwtWIRm/knrf+6AmIHw8+zQ8km777xGbpx6JPiA4iwzg7IB YmwE0pR+hsD8ZpJnrOgr/Pl+Z4fGgYh9oNZ9On6TEKIwt9JFZwQ35oVj nBNXbQ==
NSEC3PARAM 8 3 900 20260816021119 20260811014918 26695 a-star.edu.sg. tgLgJ5p3CV4ZElGpl5xyH3Rfzx2tSQczpfbmeq+sB6Z7Ns+kzTTtdSO0 gXRgbketXoZmy/Un2/cNpcE6lp6rKAFJu21whBb2PFtVTZYtOV8FV5tD 1acRQcOvX0gzZoF13J1RMA6/XNEwfws7978lFNtWDattMXfdHHI0DTFR 0Bo=

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 include:spf.a-star.edu.sg include:spf.protection.outlook.com a:a-star.edu.sg -all

DMARC

Configured

v=DMARC1; p=reject; pct=100; rua=mailto:dmarc_aggr@hq.a-star.edu.sg; ruf=mailto:dmarc_fail@hq.a-star.edu.sg

DKIM

Selector selector1

v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA17inL48kYarV6HLm3rlHL7LAPknosT26kBPe5itFdP1aqYu/tfwAIvyDmToCSUh8yMStMplbYrOMtMggwHkQmeDBPJDhWgAizJH5pi9LwcSK0hpFVsJqxCsefMF8q+pmZhrSXXg9MQL3BzqexcyddriR6stbowZMHenENFzFuGPY4Xqh9aMCZNFaMDoGPTxAQCVLY0XTcocdl+tJ4cBT7gmF2hZm/OPeuepG1fSxPK+SfcldLbB5INxtOjI9W5ns1as0vp/pqqlBOnRoYLQ9c+5n4l1PkWtUQP5uFgF4D7mEEtDyoFelhw4HTeo4euSrJPWZ4ZYkSybdMUh9XjtZEQIDAQAB;

Analyzed webpageMetadata and HTTP response

Title and description

No data

Title

Description

Final URL

https://a-star.edu.sg/

HTTP status

HTTP

Status

HTTP/2 202

Final URL

https://www.a-star.edu.sg:443/

Version

Server

CloudFront

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Amazon

a-star.edu.sg

Valid from

2026-06-16T19:00:00-05:00

Valid until

2026-12-31T17:59:59-06:00

Days remaining

142

Protocol

TLSv1.3

Cipher

TLS_AES_128_GCM_SHA256

Security headers

1 active

✓

HSTSImplemented

—

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

Consistent

✓

Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

13.251.180.0, 54.151.226.24, 54.251.88.218

255,59 ms

Cloudflare

1.1.1.1

13.251.180.0, 54.151.226.24, 54.251.88.218

487,61 ms

Quad9

9.9.9.9

13.251.180.0, 54.151.226.24, 54.251.88.218

1.753,50 ms

OpenDNS

208.67.222.222

13.251.180.0, 54.151.226.24, 54.251.88.218

600,79 ms

AdGuard

94.140.14.14

13.251.180.0, 54.151.226.24, 54.251.88.218

502,27 ms

IP, geolocation and ASNAssociated network information

13.251.180.0

No data

success

country

region

city

asn

organization

isp

54.251.88.218

No data

success

country

region

city

asn

organization

isp

54.151.226.24

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

astar-edu-sg0c.mail.protection.outlook.com

Port 25: Closed/unreachable - 37.2 ms - 
Port 465: Closed/unreachable - 4036.9 ms - 
Port 587: Closed/unreachable - 4021.2 ms -

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