`ustclug.org`

DNSSEC	⚠️ Not signed
A	2606:4700:3031::6815:22c5^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
A	2606:4700:3033::ac43:a477^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
A	104.21.34.197^{Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
A	172.67.164.119^{🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
NS	`ns-a.ustclug.org` ⭐
		A	2001:da8:d800:931::156^{🇨🇳 CNGI-HEF-IX-AS-AP2001:da8:d800::/48}
		A	202.38.93.156^{🇨🇳 ERX-CERNET-BKB202.38.64.0/19 Proxy-registered route object}
NS	`ns-b.ustclug.org`
		A	2001:da8:d800:95::94^{🇨🇳 CNGI-HEF-IX-AS-AP2001:da8:d800::/48}
		A	202.38.95.94^{🇨🇳 ERX-CERNET-BKB202.38.64.0/19 Proxy-registered route object}
NS	`ns-c.ustclug.org`
		A	116.62.60.40^{🇨🇳 Alibaba-Cloud116.62.0.0/17 China Internet Network Information Center Floor1, Building No.1 C/-Chinese Academy of Sciences 4, South 4th Street Haidian District,}
MX	`smtp.google.com` ⭐
		A	2607:f8b0:4023:c06::1a^{🇺🇸 Google2607:f8b0::/32}
			PTR	`dz-in-f26.1e100.net`
		A	2607:f8b0:4023:c06::1b^{🇺🇸 Google2607:f8b0::/32}
			PTR	`dz-in-f27.1e100.net`
		A	2607:f8b0:4023:c0b::1a^{🇺🇸 Google2607:f8b0::/32}
			PTR	`dd-in-f26.1e100.net`
		A	2607:f8b0:4023:c0b::1b^{🇺🇸 Google2607:f8b0::/32}
			PTR	`dd-in-f27.1e100.net`
		A	142.250.101.26^{🇺🇸 Google142.250.101.0/24}
			PTR	`dz-in-f26.1e100.net`
		A	142.250.101.27^{🇺🇸 Google142.250.101.0/24}
			PTR	`dz-in-f27.1e100.net`
		A	142.250.141.26^{🇺🇸 Google142.250.141.0/24}
			PTR	`dd-in-f26.1e100.net`
		A	142.250.141.27^{🇺🇸 Google142.250.141.0/24}
			PTR	`dd-in-f27.1e100.net`
		A	142.251.2.26^{🇺🇸 Google142.251.2.0/24}
			PTR	`dl-in-f26.1e100.net`
TXT	`MS=ms43950213`
TXT	`verification-code-site-App_feishu=IDMUhY2RhXjsCjXGr801`
TXT	`google-site-verification=ibXIjx6-PLlu9n-Pw1CRjCiQ75nJTRSWi6Y-rm4nznI`
TXT	`734941312-18191251`
TXT	`ca3-8a295376a5bc449482347bb09fc07add`
TXT	`v=spf1 a:ip-list.mail.ustclug.org include:_spf.google.com include:spf.protect...`
SOA	`ns-a.ustclug.org`lug@ustc.edu.cn 2026-02-24 #1

`org`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a0.org.afilias-nst.info` ⭐ ⚠️ Not in parent delegation
	NS	`a2.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`b0.org.afilias-nst.org`
	NS	`b2.org.afilias-nst.org`
	NS	`c0.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`d0.org.afilias-nst.org`
	SOA	`a0.org.afilias-nst.info`hostmaster@donuts.email serial=1774830216

📈 Tranco rank: #137,238

Subdomains

ns-c.ustclug.org

ns-a.ustclug.org

vpn.ustclug.org

www.ustclug.org

accel-proxy.ustclug.org

servers.ustclug.org

mail.ustclug.org

ns-b.ustclug.org

proxy.ustclug.org

Same first word

ustclug.org

DNS History

27 records (8 active, 19 former)

○NSdns-m.lug.ustc.edu.cn2015-07-08 → 2016-11-18 · 4 obs

● 2015-07-08 00:56:48
● 2016-11-18 16:09:20
○ 2017-02-10 11:27:00
○ 2026-03-30 00:55:50

○NSdns.lug.ustc.edu.cn2015-07-08 → 2016-12-02 · 4 obs

● 2015-07-08 00:56:48
● 2016-12-02 18:14:50
○ 2017-02-10 11:27:00
○ 2026-03-30 00:55:50

●NSns-a.ustclug.org2017-02-10 → 2026-03-30 · 3 obs

○ 2016-12-02 18:14:50
● 2017-02-10 11:27:00
● 2026-03-30 00:55:50

●NSns-b.ustclug.org2017-02-10 → 2026-03-30 · 3 obs

○ 2016-12-02 18:14:50
● 2017-02-10 11:27:00
● 2026-03-30 00:55:50

●NSns-c.ustclug.org2020-02-25 → 2026-03-30 · 3 obs

○ 2017-02-10 11:27:00
● 2020-02-25 11:20:30
● 2026-03-30 00:55:50

○MXalt1.aspmx.l.google.com2016-11-18 → 2020-02-25 · 5 obs

○ 2016-08-15 00:47:34
● 2016-11-18 16:09:20
● 2020-02-25 11:20:30
○ 2026-02-20 15:20:02
○ 2026-03-30 00:55:50

○MXalt2.aspmx.l.google.com2016-11-18 → 2020-02-25 · 5 obs

○ 2016-08-15 00:47:34
● 2016-11-18 16:09:20
● 2020-02-25 11:20:30
○ 2026-02-20 15:20:02
○ 2026-03-30 00:55:50

○MXalt3.aspmx.l.google.com2016-11-18 → 2020-02-25 · 5 obs

○ 2016-08-15 00:47:34
● 2016-11-18 16:09:20
● 2020-02-25 11:20:30
○ 2026-02-20 15:20:02
○ 2026-03-30 00:55:50

○MXalt4.aspmx.l.google.com2016-11-18 → 2020-02-25 · 5 obs

○ 2016-08-15 00:47:34
● 2016-11-18 16:09:20
● 2020-02-25 11:20:30
○ 2026-02-20 15:20:02
○ 2026-03-30 00:55:50

○MXaspmx.l.google.com2016-11-18 → 2020-02-25 · 5 obs

○ 2016-08-15 00:47:34
● 2016-11-18 16:09:20
● 2020-02-25 11:20:30
○ 2026-02-20 15:20:02
○ 2026-03-30 00:55:50

○MXlug-ustc-edu-cn.mail.eo.outlook.com2026-02-20 → 2026-02-23 · 5 obs

○ 2020-02-25 11:20:30
● 2026-02-20 15:20:02
● 2026-02-23 11:37:16
○ 2026-02-23 19:26:08
○ 2026-03-30 00:55:50

○MXmail.ustclug.org2015-07-08 → 2016-08-15 · 4 obs

● 2015-07-08 00:56:48
● 2016-08-15 00:47:34
○ 2016-11-18 16:09:20
○ 2026-03-30 00:55:50

○MXmx1.feishu.cn2026-02-23 → 2026-02-24 · 5 obs

○ 2026-02-23 11:37:16
● 2026-02-23 19:26:08
● 2026-02-24 12:13:20
○ 2026-02-25 00:10:56
○ 2026-03-30 00:55:50

○MXmx2.feishu.cn2026-02-23 → 2026-02-24 · 5 obs

○ 2026-02-23 11:37:16
● 2026-02-23 19:26:08
● 2026-02-24 12:13:20
○ 2026-02-25 00:10:56
○ 2026-03-30 00:55:50

○MXmx3.feishu.cn2026-02-23 → 2026-02-24 · 5 obs

○ 2026-02-23 11:37:16
● 2026-02-23 19:26:08
● 2026-02-24 12:13:20
○ 2026-02-25 00:10:56
○ 2026-03-30 00:55:50

●MXsmtp.google.com2026-02-25 → 2026-03-30 · 3 obs

○ 2026-02-24 12:13:20
● 2026-02-25 00:10:56
● 2026-03-30 00:55:50

○A104.18.42.2292020-02-25 → 2020-02-25 · 4 obs

○ 2017-03-18 13:36:42
● 2020-02-25 11:20:30
○ 2026-02-20 15:20:02
○ 2026-03-30 00:55:50

○A104.18.43.2292020-02-25 → 2020-02-25 · 4 obs

○ 2017-03-18 13:36:42
● 2020-02-25 11:20:30
○ 2026-02-20 15:20:02
○ 2026-03-30 00:55:50

●A104.21.34.1972026-02-20 → 2026-03-30 · 3 obs

○ 2020-02-25 11:20:30
● 2026-02-20 15:20:02
● 2026-03-30 00:55:50

●A172.67.164.1192026-02-20 → 2026-03-30 · 3 obs

○ 2020-02-25 11:20:30
● 2026-02-20 15:20:02
● 2026-03-30 00:55:50

○A2001:da8:d800:22::1232015-07-08 → 2017-03-18 · 4 obs

● 2015-07-08 00:56:48
● 2017-03-18 13:36:42
○ 2020-02-25 11:20:30
○ 2026-03-30 00:55:50

○A202.141.162.1232015-07-08 → 2016-12-02 · 4 obs

● 2015-07-08 00:56:48
● 2016-12-02 18:14:50
○ 2017-02-10 11:27:00
○ 2026-03-30 00:55:50

○A202.141.176.932017-02-10 → 2017-03-18 · 5 obs

○ 2016-12-02 18:14:50
● 2017-02-10 11:27:00
● 2017-03-18 13:36:42
○ 2020-02-25 11:20:30
○ 2026-03-30 00:55:50

●A2606:4700:3031::6815:22c52026-02-20 → 2026-03-30 · 3 obs

○ 2020-02-25 11:20:30
● 2026-02-20 15:20:02
● 2026-03-30 00:55:50

○A2606:4700:3033::6812:2ae52020-02-25 → 2020-02-25 · 4 obs

○ 2017-03-18 13:36:42
● 2020-02-25 11:20:30
○ 2026-02-20 15:20:02
○ 2026-03-30 00:55:50

●A2606:4700:3033::ac43:a4772026-02-20 → 2026-03-30 · 3 obs

○ 2020-02-25 11:20:30
● 2026-02-20 15:20:02
● 2026-03-30 00:55:50

○A2606:4700:3034::6812:2be52020-02-25 → 2020-02-25 · 4 obs

○ 2017-03-18 13:36:42
● 2020-02-25 11:20:30
○ 2026-02-20 15:20:02
○ 2026-03-30 00:55:50

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
org	b0.org.afilias-nst.org, b2.org.afilias-nst.org, d0.org.afilias-nst.org	-
ustclug.org	ns-a.ustclug.org, ns-c.ustclug.org, ns-b.ustclug.org	5 records

✅ Authoritative Response

Server:202.38.93.156

NS records: ns-a.ustclug.org, ns-c.ustclug.org, ns-b.ustclug.org

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for ustclug.org (unsigned zone)

⏱️ Timing

Total: 703ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.164.119, 104.21.34.197`
AAAA	2	`2606:4700:3033::ac43:a477, 2606:4700:3031::6815:22c5`
NS	3	`ns-c.ustclug.org, ns-b.ustclug.org...`
MX	1	`smtp.google.com (pri: 1)`
TXT	6	`734941312-18191251, google-site-verification=ibXIjx6-PLlu9n-...`
SOA	1	`ns-a.ustclug.org lug.ustc.edu.cn`

📌 Glue Records Collected

Total: 5

In-bailiwick: 5 (ns-a.ustclug.org, ns-b.ustclug.org, ns-c.ustclug.org...)

Analysis

Hierarchy

ustclug.org is a parent of ns-c.ustclug.org, ns-a.ustclug.org, vpn.ustclug.org, www.ustclug.org, accel-proxy.ustclug.org and a few other host names.

IP Addresses

ustclug.org maps to four IP numbers: 2606:4700:3031::6815:22c5, 2606:4700:3033::ac43:a477, 104.21.34.197 and 172.67.164.119.

Other host names such as drewrocks.com, marykay.co.nz, burfasaret.com, petridis-ex.gr and northshorekiwanis.com share IPs with ustclug.org.

Name Servers

ustclug.org is delegated to three name servers: ns-a.ustclug.org, ns-b.ustclug.org and ns-c.ustclug.org.

ustclug.org at least partially shares name servers with other domains, for example lug.ustc.edu.cn, pxe.ustc.edu.cn and mirrors.ustc.edu.cn.

Host names with two IPs:

ns-a.ustclug.org points to 2001:da8:d800:931::156 and 202.38.93.156.

ns-b.ustclug.org points to 2001:da8:d800:95::94 and 202.38.95.94.

Host names with one IP:

ns-c.ustclug.org points to 116.62.60.40.

Mail Servers

The smtp.google.com mail server handles ustclug.org.

ustclug.org shares the same mail server setup as other domains, including phantom3dstudio.com, ravbc.org, lazysunday.info, moni.ro and vitorfaria.com.

ustclug.org shares at least partially some mail servers with other domains, for instance otoplus.com, jeantrujillo.com, avianexperiences.com, krashaon.com and jimsch.org.

These mail servers commonly pair with aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, alt3.aspmx.l.google.com and alt4.aspmx.l.google.com.

The host name smtp.google.com maps to nine IP numbers: 2607:f8b0:4023:c06::1a, 2607:f8b0:4023:c06::1b, 2607:f8b0:4023:c0b::1a, 2607:f8b0:4023:c0b::1b, 142.250.101.26, 142.250.101.27, 142.250.141.26, 142.250.141.27 and 142.251.2.26.

ustclug.org - robtex.com

ustclug.org

org

Subdomains

Same first word

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

Hierarchy

IP Addresses

Name Servers

Mail Servers

`ustclug.org`

`org`