`a57521.com`

DNSSEC	⚠️ Not signed
A	221.236.21.142^{🇨🇳 CHINANET-SCIDC-AS-AP221.236.21.0/24 SICHUANIDC province network}
		PTR	`142.21.236.221.broad.cd.sc.dynamic.163data.com.cn`
NS	`ns1.julydns.com` ⭐
		A	47.97.51.45^{🇨🇳 Alibaba-Cloud47.96.0.0/15 Aliyun Computing Co., LTD}
NS	`ns2.julydns.com`
		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=1753036185

`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=1774518757

Same first word

a57521.com

DNS History

5 records (3 active, 2 former)

○NSf1g1ns1.dnspod.net2018-07-26 → 2018-07-26 · 3 obs

● 2018-07-26 16:08:08
○ 2026-03-17 07:25:06
○ 2026-03-26 10:08:12

○NSf1g1ns2.dnspod.net2018-07-26 → 2018-07-26 · 3 obs

● 2018-07-26 16:08:08
○ 2026-03-17 07:25:06
○ 2026-03-26 10:08:12

●NSns1.julydns.com2026-03-17 → 2026-03-26 · 3 obs

○ 2018-07-26 16:08:08
● 2026-03-17 07:25:06
● 2026-03-26 10:08:12

●NSns2.julydns.com2026-03-17 → 2026-03-26 · 3 obs

○ 2018-07-26 16:08:08
● 2026-03-17 07:25:06
● 2026-03-26 10:08:12

●A221.236.21.1422026-03-17 → 2026-03-26 · 2 obs

● 2026-03-17 07:25:06
● 2026-03-26 10:08:12

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
a57521.com	ns1.julydns.com, ns2.julydns.com	2 records

✅ Authoritative Response

Server:162.159.48.223

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for a57521.com (unsigned zone)

⏱️ Timing

Total: 432ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`221.236.21.142`
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.julydns.com, ns2.julydns.com)

Analysis

IP Addresses

a57521.com points to a single IP address: 221.236.21.142.

Other host names such as deepon.cn and www.deepon.cn share IP numbers with a57521.com.

Name Servers

a57521.com is delegated to two name servers: ns1.julydns.com and ns2.julydns.com.

a57521.com uses the same name server setup as other domains, including truckman.com.cn, iwepu.com, replicabay.com, vmls.cn and mw24.cn.

At least part of the name servers for a57521.com are shared with other domains, for instance 2y5kx.cn, yyeg.cn, 67543.cn, shenmeilife.com and job12333.com.

These name servers are commonly used alongside ns1.judns.com and ns2.judns.com.

Hostnames with a single IP

ns1.julydns.com resolves to: 47.97.51.45.

ns2.julydns.com resolves to: 162.159.48.223.

a57521.com - robtex.com

a57521.com

com