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Total

DNS

Email

Security

Network

100

Availability

Domainustc.edu.cn

IPv41

IPv61

MX records1

StatusActive

Domain technical report

ustc.edu.cn

Generated: 2026-08-09T03:31:44-05:00 · Cached result

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IPv41

IPv61

MX1

NS2

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

1 IPv4 address(es) detected.

✓

IPv6 (AAAA)10 / 10 pts · Dns

1 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

48 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers8 / 35 pts · Security

2 of 9 evaluated headers detected.

PTR reverse DNS0 / 30 pts · Network

PTR not detected.

IPv4 diversity20 / 35 pts · Network

Two or more IPv4 addresses receive full points.

✓

IPv6 connectivity35 / 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)

202.38.64.246

AAAA

1 record(s)

2001:da8:d800:642::248

CNAME

0 record(s)

—

Not configured

MX

1 record(s)

5 smtp.ustc.edu.cn.

TXT

3 record(s)

"v=spf1 ip4:202.38.64.8 ip4:202.38.64.16 ip4:202.38.64.46 ip4:210.45.120.152 ip4:202.141.161.73 ip4:195.128.10.69 ip4:199.168.14.54 ip4:202.141.163.236 ip4:205.201.128.18 ip4:210.45.71.12 ip4:195.128.10.18 ip4:195.128.10.15 -all"
"MS=ms26813611"
"google-site-verification=n_uAijUqmjntOJL0L8N4SIIdw_3cAngmXFBIYgIDNkg"

NS

2 record(s)

mx.ustc.edu.cn.
ns.ustc.edu.cn.

SOA

1 record(s)

ns.ustc.edu.cn. james.ustc.edu.cn. 2024111838 1200 900 604800 600

CAA

0 record(s)

—

Not configured

DS

1 record(s)

19065 7 2 EBD1C6420F893D8FF9950ADBF896075D059006439419634128566709 8EBD74F1

DNSKEY

2 record(s)

257 3 7 AwEAAbhtB5jRa0xcRdXjJhSsJhWUv9ZOf3hwHgSJDtBH33/Gf2eBuPFY l91L8O0LzoYQmywOp7yQmmYMvrOpERPE92wDEjH4sYQG2aR3YUIuKmNt k6JXARQi37rmbiCHknq3ir2Ey5WuG8d085OOkMVMLy8Vt+GhMOLFAVAd FHmBqSnWHjaXVPdEEUoxcz0vL3/xq7bivQy1+j4lz1I1L7vqpBioE47v lm0gBGSz0+RdFh2UdqxthvH/Mj2BcZLQ8mS7UhAgVJbRKVM2ncZr7+KH tQZhfWLHk4ULQ8YBxcZzQEALSk+70EeyJpJQClcZPWi1QmEwDbFXGVN4 +TJECo75f5c=
256 3 7 AwEAAZ/Me3jG9Lgpyh7kHMHm/jTGttmeaV2ixsEY7/cmE03Y5hYoOmkM FBGtq8xaE16hoPVDdp6QEzM/S+zMaex5JmkZ3pYwdwoslQ9VbHgTnO+n x0nt5j+moYzqiAK5ht2jJkm8vshikyVWbehMrHrrn1tjbkjPLFriaCft HAPXss13

RRSIG

10 record(s)

AAAA 7 3 3600 20260903135335 20260804135335 32747 ustc.edu.cn. Qv+GSGRNvtYX2isrcxdSqFucXSdNkDAZxGkVF7w3qU9R3Zd8f5qv+lNk rzcYE8h0Cw3Kctxse+IMrjqegMdQxtclFH0MD01OLvICycudo7azRyH6 n1ZD9d3A0+U41/Dl3/i45D8x4ZiE5GG0Fr35Bgsew5ys0fjq0kQeU/4C oY4=
TXT 7 3 3600 20260903135335 20260804135335 32747 ustc.edu.cn. DleS5rrFSmmSvHit+N11CM2cuUyv+3Ajw0gwMrapMaEIhcKRHNGtvzJQ mPqfSyM71lT6yG9IfoisBwWnxP3lQxLGtZVWZBjghn8DboEza5YLTIqO TjB/WkRqc7evmgy2HoWEfKAU7H3VXLbdHSgOkG+nY6T1wOW4pQL/eJk/ /RY=
NS 7 3 3600 20260903135335 20260804135335 32747 ustc.edu.cn. F27Sj48ogj4VcQOHdfsjU1c5kerUNx5qWdF9kJd/f+qxPCHf/aUWiP+F ImUe/ShJ6a4mcrw1ogNMyTaNg7ZUvnwJA0ZXy9fr91cISAgK1gW32OdE AfwkqVp7M668ACo+sgL6PTe16Vc1Xcj18Kpp7kXoHq/gSuSPMowK/mV9 JPM=
SOA 7 3 3600 20260903135335 20260804135335 32747 ustc.edu.cn. Vb51YWTIrKfQGsPaNHq+aiMP+weUxvalGYaFuD44EFftDcZTUuP8N3Ek tgNNTHOA9p9Ya8APpnxMr0tBrSrhtDc5zZO9B7H9DUbFpwnQv/1kAJgp rPMAHTR8doBoUowFyh2QVGaJrVs4TyyIzJTBEP4si2QGQ9tDf1tmJ8O8 +KY=
DNSKEY 7 3 1200 20260903135335 20260804135335 32747 ustc.edu.cn. EbxMk/I/mGiCuW+/3dLdwqEvKY5/AMTDnKf3jBJaan5H3q2i4jOKkyZW 6Cvfwxc8uvOJeFv4KldPsdWnqxQ6cgYxIHzLxjZe4JEd9ANBCLdQaChB gWMLoPkOIkxqyy+lmwpzwOP9tgy3sWP7UYuMMvSLlbiujBKBNXOXmr/L fsM=
DNSKEY 7 3 1200 20260903135335 20260804135335 19065 ustc.edu.cn. XsEdi1itEwxw87ooTwwftXw8I5DgW89GZa42GBcHWIGehU/p6lq+bBG1 SUZ81puefw/vN/fKn1vxWBdskgMWgMXVccUMDY0s43fvERFcis+7aWgl REBw/QO8k0Br0b3+8B1MVsRILggz5pI3P9eGFsdVayBa9eq4k/jhSXZx qT9gPXQ3eARhGAbr+1kB1hu5coz++wvsdauDJojsIutolGlEBR/1UVZ3 vbOhF92aWmHgN2t2OIncokGlUy18fdmomHja/c2CdumbsBvsAQ3ailHM IhMPZ0sm8WMlgVsDsCUdgCcVqQ62sPeXiQyGCZjS6iS3AVsWOaHreOHW OOwRMA==
MX 7 3 3600 20260903135335 20260804135335 32747 ustc.edu.cn. MoQ9oDS/uWXkaI3X4jyelsO96nuQe6so8lMTY/r+zJeClAPrn52JHkdu Q+gI4hyZZrDO0NAKCaroP4ym2iyLBVTImNkU6YXZcjEWjH8Bk7nlW8Mx xkU90UMhMr7Ck05AlggbBRpXdwmjM8OIvLHlRJTi6F4/GhmQ1BjfjAft RL4=
A 7 3 3600 20260903135335 20260804135335 32747 ustc.edu.cn. YW5urrKTwLjq7wn9RXASMnj+sR4Bg+5QG3yT/DAPe+YXF9gJsNVqKNmg QkR8NRPZdgw+l39PPZKb/vG8ZaqkGBeNhrUryIHBCe9dD0a3ae5+ULTl 7UZmTI9hiAiAox9B5hzDErKqkZK11vm6LOhpP2skAoSqiebwCP3cMMi4 e48=
DS 8 3 172800 20260818145404 20260804141213 44583 edu.cn. hH6o3QGIBFFSWZdozpIQu7DGx5Ao/uTi/l4UlBVNPTZKJnXeCxeVjJrc PMfWh4HdDCHjZaFHKLGn2VJig5LH77gYTM9kHTblEHlypipRFj86FHMf hZdR1wHJZ15mJk94SGlosxpByiYs98tP+va4JItfaCBbqjYtMvpElirv bZBqjPlbfVEuz3sFV37QAOW1l/ahXHyFoEac5yRaVxM6uUHgfCfIbIjT PER+nghD10YHSnZ6bo1RJnvYfB2eoa/T+lq/0Fa48+LrDE4dAGb1TfHS zk/rvQzUswQ3a5hAeRzIQhtquG3eROo1Gbyp14DYStjT25E3wYkEE2QC kUSdqw==
NSEC3PARAM 7 3 0 20260903135335 20260804135335 32747 ustc.edu.cn. jQajbImC3gvI3vUa7NzaW1tngjQozRnhH9k+Rt3hs+7ZZ9O6trgHePrA 0oGHcQ55NFf0gLADCz0x9YOHviyZW6tp29cPWHHEwjOY+BsdQ4pg7TIG 1dvdGRAUU5aOPGnhqpq42j8AMIVO5LTC0S3f2kOKbx/70yK0nMSrzOn6 zYk=

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 ip4:202.38.64.8 ip4:202.38.64.16 ip4:202.38.64.46 ip4:210.45.120.152 ip4:202.141.161.73 ip4:195.128.10.69 ip4:199.168.14.54 ip4:202.141.163.236 ip4:205.201.128.18 ip4:210.45.71.12 ip4:195.128.10.18 ip4:195.128.10.15 -all

DMARC

Configured

v=DMARC1; p=quarantine; rua=mailto:postmaster@ustc.edu.cn

DKIM

Selector dkim

v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDJvKz7FR0FC8iH15PgZIW720prG7yeJSc0ZVtrT1Q6pOazbMevkNTIYap+VQfh0qqrkDq0WXiJJ6IwURaPFluYs5Gxcj84RAX9s2qBhzlGA6HdvRGH8PwnFW4wacM6c8v62aWP/NfslJg+LZkRpLJG7e52Fv6RFKhkoNpQYyGfmQIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

No data

Title

Description

Final URL

https://ustc.edu.cn/

HTTP status

HTTP

Status

HTTP/2 200

Final URL

https://ustc.edu.cn/

Version

Server

nginx

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

ZeroSSL GmbH

ustc.edu.cn

Valid from

2026-06-27T19:00:00-05:00

Valid until

2026-09-26T18:59:59-05:00

Days remaining

Protocol

TLSv1.3

Cipher

TLS_AES_256_GCM_SHA384

Security headers

2 active

✓

HSTSImplemented

—

Content Security PolicyNot detected

—

X-Content-Type-OptionsNot detected

✓

X-Frame-OptionsImplemented

—

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

202.38.64.246

273,61 ms

Cloudflare

1.1.1.1

202.38.64.246

269,98 ms

Quad9

9.9.9.9

202.38.64.246

332,27 ms

OpenDNS

208.67.222.222

202.38.64.246

900,81 ms

AdGuard

94.140.14.14

202.38.64.246

304,53 ms

IP, geolocation and ASNAssociated network information

202.38.64.246

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

smtp.ustc.edu.cn

Port 25: Closed/unreachable - 241.9 ms - 
Port 465: Closed/unreachable - 240.5 ms - 
Port 587: Closed/unreachable - 4312.6 ms -

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