`drdobbs.cn`

DNSSEC	🔒 Signed (DS record present)
A	2606:4700:3036::ac43:9f0a^{🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3037::6815:3135^{🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.49.53^{Cloudflare104.21.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.159.10^{🇺🇸 Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`ns1.ubmdns.com` ⭐
		A	2400:cb00:2049:1::a29f:d0^{🇺🇸 Cloudflare2400:cb00:2049::/48 , Inc. 101 Townsend Street}
			PTR	`ns1.ubmdns.com`
		A	162.159.0.208^{Cloudflare162.159.0.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
NS	`ns2.ubmdns.com`
		A	2400:cb00:2049:1::a29f:1d0^{🇺🇸 Cloudflare2400:cb00:2049::/48 , Inc. 101 Townsend Street}
			PTR	`ns2.ubmdns.com`
		A	162.159.1.208^{Cloudflare162.159.1.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`ns2.ubmdns.com`
TXT	`v=spf1 mx include:spf.ubm-us.net -all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.49.53, 172.67.159.10
		IPv6 hints	2606:4700:3036::ac43:9f0a, 2606:4700:3037::6815:3135
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=174, name=cloudflare-ech.com
SOA	`ns1.ubmdns.com`dns@cloudflare.com serial=2409121091

`cn`

	DNSSEC	🔒 Signed (DS record present)
	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=2035056958

Same first word

drdobbs.org

drdobbs.us

drdobbs.(0x787878)

drdobbs.net

drdobbs.cn

drdobbs.com

drdobbs.com.cn

drdobbs.in

DNS History

15 records (6 active, 9 former)

○NSns1.ubm-us.net2015-07-15 → 2016-06-14 · 4 obs

● 2015-07-15 22:07:56
● 2016-06-14 22:45:44
○ 2017-10-04 07:59:40
○ 2026-07-18 16:32:18

●NSns1.ubmdns.com2026-07-13 → 2026-07-18 · 3 obs

○ 2017-10-04 07:59:40
● 2026-07-13 10:49:30
● 2026-07-18 16:32:18

○NSns1.ubmits.com2017-10-04 → 2017-10-04 · 4 obs

○ 2016-06-14 22:45:44
● 2017-10-04 07:59:40
○ 2026-07-13 10:49:30
○ 2026-07-18 16:32:18

○NSns2.ubm-us.net2015-07-15 → 2016-06-14 · 4 obs

● 2015-07-15 22:07:56
● 2016-06-14 22:45:44
○ 2017-10-04 07:59:40
○ 2026-07-18 16:32:18

●NSns2.ubmdns.com2026-07-13 → 2026-07-18 · 3 obs

○ 2017-10-04 07:59:40
● 2026-07-13 10:49:30
● 2026-07-18 16:32:18

○NSns2.ubmits.com2017-10-04 → 2017-10-04 · 4 obs

○ 2016-06-14 22:45:44
● 2017-10-04 07:59:40
○ 2026-07-13 10:49:30
○ 2026-07-18 16:32:18

○NSns3.ubm-us.net2015-07-15 → 2016-06-14 · 4 obs

● 2015-07-15 22:07:56
● 2016-06-14 22:45:44
○ 2017-10-04 07:59:40
○ 2026-07-18 16:32:18

○NSns3.ubmits.com2017-10-04 → 2017-10-04 · 4 obs

○ 2016-06-14 22:45:44
● 2017-10-04 07:59:40
○ 2026-07-13 10:49:30
○ 2026-07-18 16:32:18

○MXmailhost.ubm-us.net2015-07-15 → 2017-10-04 · 4 obs

● 2015-07-15 22:07:56
● 2017-10-04 07:59:40
○ 2026-07-13 10:49:30
○ 2026-07-18 16:32:18

●A104.21.49.532026-07-13 → 2026-07-18 · 3 obs

○ 2017-10-04 07:59:40
● 2026-07-13 10:49:30
● 2026-07-18 16:32:18

●A172.67.159.102026-07-13 → 2026-07-18 · 3 obs

○ 2017-10-04 07:59:40
● 2026-07-13 10:49:30
● 2026-07-18 16:32:18

○A192.155.48.932015-07-15 → 2017-10-04 · 4 obs

● 2015-07-15 22:07:56
● 2017-10-04 07:59:40
○ 2026-07-13 10:49:30
○ 2026-07-18 16:32:18

●A2606:4700:3036::ac43:9f0a2026-07-13 → 2026-07-18 · 3 obs

○ 2017-10-04 07:59:40
● 2026-07-13 10:49:30
● 2026-07-18 16:32:18

●A2606:4700:3037::6815:31352026-07-13 → 2026-07-18 · 3 obs

○ 2017-10-04 07:59:40
● 2026-07-13 10:49:30
● 2026-07-18 16:32:18

○A2620:103::192:155:48:932015-07-15 → 2017-10-04 · 4 obs

● 2015-07-15 22:07:56
● 2017-10-04 07:59:40
○ 2026-07-13 10:49:30
○ 2026-07-18 16:32:18

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cn	a.dns.cn, b.dns.cn, c.dns.cn, d.dns.cn...	-
drdobbs.cn	ns1.ubmdns.com, ns2.ubmdns.com	-

✅ Authoritative Response

Server:162.159.0.208

NS records: ns1.ubmdns.com, ns2.ubmdns.com

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 982ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.159.10, 104.21.49.53`
AAAA	2	`2606:4700:3037::6815:3135, 2606:4700:3036::ac43:9f0a`
NS	2	`ns1.ubmdns.com, ns2.ubmdns.com`
TXT	1	`v=spf1 mx include:spf.ubm-us.net -all`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`ns1.ubmdns.com dns.cloudflare.com`

Analysis

IP Addresses

drdobbs.cn directs to four IP numbers, which are 104.21.49.53, 172.67.159.10, 2606:4700:3036::ac43:9f0a and 2606:4700:3037::6815:3135.

Two other host names, along with montania-creative.com, letsraw.com and airmoney.lat, also share IP numbers with drdobbs.cn.

Name Servers

drdobbs.cn uses two name servers for its delegation: ns1.ubmdns.com and ns2.ubmdns.com.

drdobbs.cn shares its NS records with other domains, for example barbour-index.co.uk, decorexuk.co.uk, webreview.com and two others.

The two host names ns1.ubmdns.com and ns2.ubmdns.com each have a pair of IP addresses: ns1.ubmdns.com has 162.159.0.208 and 2400:cb00:2049:1::a29f:d0, and ns2.ubmdns.com has 162.159.1.208 and 2400:cb00:2049:1::a29f:1d0.

drdobbs.cn - robtex.com

drdobbs.cn

cn

Same first word

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

Analysis

IP Addresses

Name Servers

`drdobbs.cn`

`cn`