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`cas.cn`

DNSSEC	⚠️ Not signed
A	2400:dd01:1017:1000::9fe2:f23d^{🇨🇳 CSTNET-AS-AP}
A	159.226.242.61^{🇨🇳 CSTNET-AS-AP}
NS	`ns1.cdns.cn` ⭐
		A	2001:dc7:ffeb::1^{🇨🇳 CNNIC-CRITICAL-AP}
			PTR	`ns1.cdns.cn`
		A	125.208.45.1^{🇨🇳 CNNIC-CRITICAL-AP}
NS	`ns3.cstnet.cn`
		A	159.226.18.13^{🇨🇳 CSTNET-AS-AP}
NS	`ns4.cstnet.cn`
		A	159.226.18.14^{🇨🇳 CSTNET-AS-AP}
MX	`mx.cstnet.cn` ⭐
		A	159.226.251.12^{🇨🇳 CSTNET-AS-AP}
			PTR	`mx.cstnet.cn`
TXT	`v=spf1 include:spf.mail.cstnet.cn -all`
SOA	`ns1.cdns.cn`mail@cnnic.cn serial=4579

`cn`

	DNSSEC	⚠️ Not signed
	NS	`a.dns.cn` ⭐ 🔒
	NS	`b.dns.cn`
	NS	`c.dns.cn` 🔒
	NS	`d.dns.cn` 🔒
	NS	`e.dns.cn` 🔒
	NS	`ns.cernet.net` ⚠️ Not in parent delegation
	SOA	`a.dns.cn`root@cnnic.cn serial=2034456417

rank #2543 globally
rank #32 in the tld
This domain "cas.cn" belongs to the Chinese Academy of Sciences, a national scientific think tank and academic governing body that provides advisory and appraisal services on issues stemming from the national economy, social development, and science and technology progress. It conducts research in basic and technological sciences, undertakes national major scientific and technological tasks, and provides important scientific and technological advice to government departments.WOT: SAFE (77/100)
📈 Tranco rank: #10,819

Previously NS for

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DNS History

15 records (6 active, 9 former)

○NScas.cn2015-08-23 → 2019-09-15 · 35 obs

○ 2008-12-10 06:25:42
● 2015-08-23 01:09:08
● 2015-12-30 21:10:02
○ 2016-01-16 00:33:18
○ 2016-04-19 13:21:02
● 2016-05-25 01:02:04
○ 2016-06-04 09:40:18
○ 2016-09-20 21:07:54
● 2016-10-07 09:13:42
● 2016-11-23 18:57:38
○ 2016-11-26 21:07:00
● 2016-11-30 12:29:46
○ 2016-12-04 16:14:38
○ 2016-12-16 13:42:48
● 2016-12-17 20:06:10
○ 2016-12-21 10:07:04
○ 2016-12-28 00:18:16
● 2016-12-30 04:38:30
● 2017-01-15 05:45:50
○ 2017-01-16 22:01:36
○ 2017-02-05 09:23:14
● 2017-02-12 04:03:00
○ 2017-04-04 15:30:14
○ 2018-01-01 02:47:46
● 2018-01-20 05:38:06
○ 2018-02-07 00:19:52
○ 2018-03-08 05:32:46
● 2018-04-02 23:24:34
○ 2018-05-20 09:01:48
○ 2018-06-15 03:23:20
● 2018-08-24 14:35:26
○ 2019-07-29 22:42:54
● 2019-09-15 13:48:26
○ 2020-02-17 23:39:56
○ 2026-02-18 20:47:20

○NSnic.cashq.ac.cn2008-12-10 → 2008-12-10 · 3 obs

● 2008-12-10 06:25:42
○ 2015-08-23 01:09:08
○ 2026-02-18 20:47:20

○NSns.cashq.ac.cn2015-08-23 → 2020-05-13 · 8 obs

○ 2008-12-10 06:25:42
● 2015-08-23 01:09:08
● 2018-05-20 09:01:48
○ 2018-06-15 03:23:20
○ 2020-02-17 23:39:56
● 2020-05-13 05:05:22
○ 2020-09-16 03:06:02
○ 2026-02-18 20:47:20

●NSns1.cdns.cn2016-01-16 → 2026-02-18 · 33 obs

○ 2015-12-30 21:10:02
● 2016-01-16 00:33:18
● 2016-04-19 13:21:02
○ 2016-05-25 01:02:04
● 2016-06-04 09:40:18
● 2016-09-20 21:07:54
○ 2016-10-07 09:13:42
○ 2016-11-23 18:57:38
● 2016-11-26 21:07:00
○ 2016-11-30 12:29:46
● 2016-12-04 16:14:38
● 2016-12-16 13:42:48
○ 2016-12-17 20:06:10
● 2016-12-21 10:07:04
● 2016-12-28 00:18:16
○ 2016-12-30 04:38:30
○ 2017-01-15 05:45:50
● 2017-01-16 22:01:36
● 2017-02-05 09:23:14
○ 2017-02-12 04:03:00
● 2017-04-04 15:30:14
● 2018-01-01 02:47:46
○ 2018-01-20 05:38:06
● 2018-02-07 00:19:52
● 2018-03-08 05:32:46
○ 2018-04-02 23:24:34
● 2018-05-20 09:01:48
● 2018-06-15 03:23:20
○ 2018-08-24 14:35:26
● 2019-07-29 22:42:54
○ 2019-09-15 13:48:26
● 2020-02-17 23:39:56
● 2026-02-18 20:47:20

○NSns2.cdns.cn2016-01-16 → 2021-04-25 · 5 obs

○ 2015-12-30 21:10:02
● 2016-01-16 00:33:18
● 2021-04-25 02:42:30
○ 2026-02-15 01:05:30
○ 2026-02-18 20:47:20

○NSns3.cdns.cn2016-01-16 → 2021-04-25 · 5 obs

○ 2015-12-30 21:10:02
● 2016-01-16 00:33:18
● 2021-04-25 02:42:30
○ 2026-02-15 01:05:30
○ 2026-02-18 20:47:20

●NSns3.cstnet.cn2026-02-15 → 2026-02-18 · 3 obs

○ 2021-04-25 02:42:30
● 2026-02-15 01:05:30
● 2026-02-18 20:47:20

●NSns4.cstnet.cn2026-02-15 → 2026-02-18 · 3 obs

○ 2021-04-25 02:42:30
● 2026-02-15 01:05:30
● 2026-02-18 20:47:20

○NSzdns1.cnnic.cn2015-08-23 → 2015-12-30 · 5 obs

○ 2008-12-10 06:25:42
● 2015-08-23 01:09:08
● 2015-12-30 21:10:02
○ 2016-01-16 00:33:18
○ 2026-02-18 20:47:20

○NSzdns2.cnnic.cn2015-08-23 → 2015-12-30 · 5 obs

○ 2008-12-10 06:25:42
● 2015-08-23 01:09:08
● 2015-12-30 21:10:02
○ 2016-01-16 00:33:18
○ 2026-02-18 20:47:20

○NSzdns3.cnnic.cn2015-08-23 → 2015-12-30 · 5 obs

○ 2008-12-10 06:25:42
● 2015-08-23 01:09:08
● 2015-12-30 21:10:02
○ 2016-01-16 00:33:18
○ 2026-02-18 20:47:20

○MXmx.cas.cn2008-12-10 → 2008-12-10 · 3 obs

● 2008-12-10 06:25:42
○ 2015-08-23 01:09:08
○ 2026-02-18 20:47:20

●MXmx.cstnet.cn2015-08-23 → 2026-02-18 · 3 obs

○ 2008-12-10 06:25:42
● 2015-08-23 01:09:08
● 2026-02-18 20:47:20

●A159.226.242.612026-02-15 → 2026-02-18 · 2 obs

● 2026-02-15 01:05:30
● 2026-02-18 20:47:20

●A2400:dd01:1017:1000::9fe2:f23d2026-02-15 → 2026-02-18 · 2 obs

● 2026-02-15 01:05:30
● 2026-02-18 20:47:20

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cn	e.dns.cn, d.dns.cn, a.dns.cn, c.dns.cn...	-
cas.cn	ns3.cstnet.cn, ns4.cstnet.cn	2 records

✅ Authoritative Response

Server: 159.226.18.13

NS records: ns3.cstnet.cn, ns4.cstnet.cn

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for cas.cn (unsigned zone)

⏱️ Timing

Total: 1184ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`159.226.242.61`
AAAA	1	`2400:dd01:1017:1000::9fe2:f23d`
NS	2	`ns3.cstnet.cn, ns4.cstnet.cn`
MX	1	`mx.cstnet.cn (pri: 5)`
TXT	1	`v=spf1 include:spf.mail.cstnet.cn -all`
SOA	1	`ns1.cdns.cn mail.cnnic.cn`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns3.cstnet.cn, ns4.cstnet.cn)

AI analysis

cas.cn is the parent of isa.cas.cn, iop.cas.cn, ime.cas.cn, ciac.cas.cn, ihns.cas.cn and hundreds of other host names.

cas.cn resolves to two IPs: 2400:dd01:1017:1000::9fe2:f23d and 159.226.242.61.

other host names for instance www.cas.cn, casad.cas.cn, m.cas.cn, lssf.cas.cn and bic.cas.cn share IP numbers with cas.cn.

cas.cn is delegated to three name servers: ns1.cdns.cn, ns3.cstnet.cn and ns4.cstnet.cn.

cas.cn at least partially shares name servers with other domains, for instance sport.gov.cn, csdb.cn, cstcloud.cn, chinaconsulatechicago.org and llas.ac.cn.

These name servers are often used together with the name servers ns2.cdns.cn, ns3.cdns.cn, ns1.xgslb.net, ns.sdb.ac.cn, ns3.fmprc.gov.cn, ns.fmprc.gov.cn, ns1.news.cn, ns3.news.cn, ns and nieer.sccas.cn.

Host names with two IPs:

ns1.cdns.cn points to 2001:dc7:ffeb::1 and 125.208.45.1.

Host names with one IP:

ns3.cstnet.cn points to 159.226.18.13.

ns4.cstnet.cn points to 159.226.18.14.

cas.cn is handled by a single mail server, mx.cstnet.cn.

cas.cn shares the same mail server setup as other domains, for instance cioc.ac.cn, biotech.org.cn, mail.itp.ac.cn, sun.im.ac.cn and vlcc.cn.

Host name mx.cstnet.cn points to IP address 159.226.251.12.