21study.net - robtex.com
21study.net
| DNSSEC | ⚠️ Not signed | ||||||
| A | 154.31.167.232🇩🇪 NEBULA-GLOBAL154.31.167.0/24 STARCLOUD GLOBAL | ||||||
| NS | a.share-dns.com ⭐ | ||||||
| A | 172.64.53.25🇺🇸 Cloudflare172.64.53.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| NS | b.share-dns.net | ||||||
| A | 172.64.52.239🇺🇸 Cloudflare172.64.52.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| SOA | a.share-dns.commaster@share-dns.com serial=1758098212 | ||||||
net
| 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.netnstld@verisign-grs.com serial=1774515542 | ||||||
Same first word
21study.net |
Similar names
DNS History
8 records (3 active, 5 former)
●NSa.share-dns.com2026-02-25 → 2026-03-26 · 3 obs
● 2026-02-25 19:47:48
● 2026-03-26 09:18:46
●NSb.share-dns.net2026-02-25 → 2026-03-26 · 3 obs
● 2026-02-25 19:47:48
● 2026-03-26 09:18:46
○NSf1g1ns1.dnspod.net2020-02-20 → 2020-02-20 · 3 obs
○ 2026-02-25 19:47:48
○ 2026-03-26 09:18:46
○NSf1g1ns2.dnspod.net2020-02-20 → 2020-02-20 · 3 obs
○ 2026-02-25 19:47:48
○ 2026-03-26 09:18:46
○MXmxbiz1.qq.com2020-02-20 → 2020-02-20 · 3 obs
○ 2026-02-25 19:47:48
○ 2026-03-26 09:18:46
○MXmxbiz2.qq.com2020-02-20 → 2020-02-20 · 3 obs
○ 2026-02-25 19:47:48
○ 2026-03-26 09:18:46
○A134.175.107.1592020-02-20 → 2020-02-20 · 3 obs
○ 2026-02-25 19:47:48
○ 2026-03-26 09:18:46
●A154.31.167.2322026-02-25 → 2026-03-26 · 3 obs
● 2026-02-25 19:47:48
● 2026-03-26 09:18:46
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| net | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| 21study.net | a.share-dns.com, b.share-dns.net | 1 record |
✅ Authoritative Response
Server:172.64.53.25
NS records: a.share-dns.com, b.share-dns.net
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for 21study.net (unsigned zone)
⏱️ Timing
Total: 1004ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 154.31.167.232 |
| NS | 2 | a.share-dns.com, b.share-dns.net |
| SOA | 1 | a.share-dns.com master.share-dns.com |
📌 Glue Records Collected
Total: 1
Out-of-bailiwick: 1 (b.share-dns.net)
Analysis
IP Addresses
21study.net resolves to a single IP: 154.31.167.232.
Name Servers
21study.net has two name servers: a.share-dns.com and b.share-dns.net.
21study.net shares the same name server setup as other domains, for example tjyuanmeng.com, bvcz.cn, badao123.com, jccs888.com and dashenxian.com.
21study.net shares some name servers with other domains, for example ghdm.net, ptclworkers.com, neipinbao.com, lqrhjs.com and sxliangsheng.com.
these name servers are often used with a4.share-dns.com, b4.share-dns.net, a1.share-dns.com, b1.share-dns.net, a6.share-dns.com, b6.share-dns.net, a11.share-dns.com, b11.share-dns.net, a3.share-dns.com and b3.share-dns.net.
Host names with a single IP:
a.share-dns.com points to 172.64.53.25
b.share-dns.net points to 172.64.52.239