`dayuclass.com`

	CNAME	`box17507492769.s166.pc51.com`
	CNAME	`s166.pc51.com`
	DNSSEC	⚠️ Not signed
	A	202.75.216.213^{🇨🇳 CHINANET-BACKBONE202.75.216.0/22 CMI (Customer Route)}

`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=1771291435

Subdomains

www.dayuclass.com

Same first word

dayuclass.com

DNS History

6 records (4 active, 2 former)

○NSns11.xincache.com2017-11-10 → 2017-11-10 · 3 obs

● 2017-11-10 04:48:12
○ 2026-03-13 21:23:40
○ 2026-03-13 21:23:44

○NSns12.xincache.com2017-11-10 → 2017-11-10 · 3 obs

● 2017-11-10 04:48:12
○ 2026-03-13 21:23:40
○ 2026-03-13 21:23:44

●NSns3.dnsv2.com2026-03-13 → 2026-03-13 · 3 obs

○ 2017-11-10 04:48:12
● 2026-03-13 21:23:40
● 2026-03-13 21:23:44

●NSns4.dnsv2.com2026-03-13 → 2026-03-13 · 3 obs

○ 2017-11-10 04:48:12
● 2026-03-13 21:23:40
● 2026-03-13 21:23:44

●MXm1.feishu.cn2026-03-13 → 2026-03-13 · 2 obs

● 2026-03-13 21:23:40
● 2026-03-13 21:23:44

●CNAMEbox17507492769.s166.pc51.com2026-03-13 → 2026-03-13 · 2 obs

● 2026-03-13 21:23:40
● 2026-03-13 21:23:44

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	k.gtld-servers.net, f.gtld-servers.net, j.gtld-servers.net, l.gtld-servers.net...	-
dayuclass.com	ns3.dnsv2.com, ns4.dnsv2.com	15 records

✅ Authoritative Response

Server: 1.12.0.30

NS records: ns3.dnsv2.com, ns4.dnsv2.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for dayuclass.com (unsigned zone)

⏱️ Timing

Total: 641ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	2	`ns4.dnsv2.com, ns3.dnsv2.com`
MX	1	`m1.feishu.cn (pri: 5)`
TXT	2	`v=spf1 +include:_netblocks.m.feishu.cn , verification-code-site-App_feishu=nOkqMg`
CNAME	1	`box17507492769.s166.pc51.com`
SOA	1	`ns3.dnsv2.com level3dnsadmin.dnspod.com`

📌 Glue Records Collected

Total: 15

Out-of-bailiwick: 15 (ns3.dnsv2.com, ns3.dnsv2.com, ns3.dnsv2.com...)

Analysis

Hierarchy

www.dayuclass.com is a child of dayuclass.com.

IP Addresses

dayuclass.com resolves to one IP number: 202.75.216.213.

Other host names, for instance xpelsh.com, donghaowl.com, ykrskj.com, qyhjgc.com and qualitykon.com.cn share IP numbers with dayuclass.com.

dayuclass.com - robtex.com

dayuclass.com

com