`51ctf.com`

DNSSEC	⚠️ Not signed
A	154.218.79.45^{🇭🇰 HDHK154.218.76.0/22 Proxy-registered route object}
NS	`ns1.julydns.com` ⭐ ⚠️ Not in parent delegation
		A	47.97.51.45^{🇨🇳 Alibaba-Cloud47.96.0.0/15 Aliyun Computing Co., LTD}
NS	`ns1.judns.com` ⚠️ Not in zone NS records
		A	47.97.51.45^{🇨🇳 Alibaba-Cloud47.96.0.0/15 Aliyun Computing Co., LTD}
NS	`ns2.judns.com` ⚠️ Not in zone NS records
		A	162.159.27.251^{Cloudflare162.159.27.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
NS	`ns2.julydns.com` ⚠️ Not in parent delegation
		A	162.159.48.223^{Cloudflare162.159.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
SOA	`ns1.julydns.com`master@jmdns.com serial=1771860460

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1774476942

Same first word

51ctf.com

DNS History

12 records (5 active, 7 former)

○NSdns10.hichina.com2016-01-17 → 2016-09-10 · 4 obs

● 2016-01-17 15:15:04
● 2016-09-10 06:03:04
○ 2017-05-20 05:40:30
○ 2026-03-25 22:31:48

○NSdns25.hichina.com2017-05-20 → 2017-05-20 · 4 obs

○ 2016-09-10 06:03:04
● 2017-05-20 05:40:30
○ 2026-02-26 03:15:58
○ 2026-03-25 22:31:48

○NSdns26.hichina.com2017-05-20 → 2017-05-20 · 4 obs

○ 2016-09-10 06:03:04
● 2017-05-20 05:40:30
○ 2026-02-26 03:15:58
○ 2026-03-25 22:31:48

○NSdns9.hichina.com2016-01-17 → 2016-09-10 · 4 obs

● 2016-01-17 15:15:04
● 2016-09-10 06:03:04
○ 2017-05-20 05:40:30
○ 2026-03-25 22:31:48

●NSns1.judns.com2026-02-26 → 2026-03-25 · 3 obs

○ 2017-05-20 05:40:30
● 2026-02-26 03:15:58
● 2026-03-25 22:31:48

●NSns1.julydns.com2026-02-26 → 2026-03-25 · 3 obs

○ 2017-05-20 05:40:30
● 2026-02-26 03:15:58
● 2026-03-25 22:31:48

●NSns2.judns.com2026-02-26 → 2026-03-25 · 3 obs

○ 2017-05-20 05:40:30
● 2026-02-26 03:15:58
● 2026-03-25 22:31:48

●NSns2.julydns.com2026-02-26 → 2026-03-25 · 3 obs

○ 2017-05-20 05:40:30
● 2026-02-26 03:15:58
● 2026-03-25 22:31:48

○A103.66.219.1402026-02-26 → 2026-03-25 · 2 obs

○ 2026-02-26 03:15:58
○ 2026-03-25 22:31:48

○A118.184.61.1202017-05-20 → 2017-05-20 · 4 obs

○ 2016-04-04 17:04:12
● 2017-05-20 05:40:30
○ 2026-02-26 03:15:58
○ 2026-03-25 22:31:48

○A123.56.229.2402016-01-17 → 2016-01-17 · 3 obs

● 2016-01-17 15:15:04
○ 2016-04-04 17:04:12
○ 2026-03-25 22:31:48

●A154.218.79.452026-02-26 → 2026-03-25 · 3 obs

○ 2017-05-20 05:40:30
● 2026-02-26 03:15:58
● 2026-03-25 22:31:48

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
51ctf.com	ns1.judns.com, ns2.judns.com	2 records

✅ Authoritative Response

Server:162.159.27.251

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 51ctf.com (unsigned zone)

⏱️ Timing

Total: 316ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`154.218.79.45`
NS	2	`ns1.julydns.com, ns2.julydns.com`
SOA	1	`ns1.julydns.com master.jmdns.com`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns1.judns.com, ns2.judns.com)

Analysis

IP Addresses

51ctf.com points to a single IP number: 154.218.79.45.

Other host names, for instance hmbfb.com, share IP numbers with 51ctf.com.

Name Servers

51ctf.com is delegated to four name servers: ns1.judns.com, ns2.judns.com, ns1.julydns.com and ns2.julydns.com.

51ctf.com shares name servers with other domains at least partially, for instance jygxfsg.com, cebity.com, jwhbwsjk.cn, aladingcn.cn and xz432.com.