21837c.com - robtex.com
21837c.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 2606:4700:3033::6815:7b7🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 2606:4700:3037::ac43:8929🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 104.21.7.183Cloudflare104.21.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 172.67.137.41🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| NS | sima.ns.cloudflare.com ⭐ | ||||||
| A | 2606:4700:50::adf5:3ade🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | sima.ns.cloudflare.com | ||||||
| A | 2803:f800:50::6ca2:c0de🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L | ||||||
| PTR | sima.ns.cloudflare.com | ||||||
| A | 2a06:98c1:50::ac40:20de🇺🇸 Cloudflare2a06:98c1:50::/45 | ||||||
| PTR | sima.ns.cloudflare.com | ||||||
| A | 108.162.192.222🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | sima.ns.cloudflare.com | ||||||
| A | 172.64.32.222🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | sima.ns.cloudflare.com | ||||||
| A | 173.245.58.222🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | sima.ns.cloudflare.com | ||||||
| NS | sterling.ns.cloudflare.com | ||||||
| A | 2606:4700:58::a29f:2c8f🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | sterling.ns.cloudflare.com | ||||||
| A | 2803:f800:50::6ca2:c38f🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L | ||||||
| PTR | sterling.ns.cloudflare.com | ||||||
| A | 2a06:98c1:50::ac40:238f🇺🇸 Cloudflare2a06:98c1:50::/45 | ||||||
| PTR | sterling.ns.cloudflare.com | ||||||
| A | 108.162.195.143🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | sterling.ns.cloudflare.com | ||||||
| A | 162.159.44.143Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | sterling.ns.cloudflare.com | ||||||
| A | 172.64.35.143🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | sterling.ns.cloudflare.com | ||||||
| HTTPS | HTTP/3, HTTP/2 ✓ hints match | ||||||
| IPv4 | 104.21.7.183, 172.67.137.41 | ||||||
| IPv6 | 2606:4700:3033::6815:7b7, 2606:4700:3037::ac43:8929 | ||||||
| SOA | sima.ns.cloudflare.comdns@cloudflare.com serial=2396982679 | ||||||
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.netnstld@verisign-grs.com serial=1771291435 | ||||||
Similar names
DNS History
6 records (6 active, 0 former)
●NSsima.ns.cloudflare.com2026-02-26 → 2026-02-26 · 2 obs
● 2026-02-26 09:27:04
●NSsterling.ns.cloudflare.com2026-02-26 → 2026-02-26 · 2 obs
● 2026-02-26 09:27:04
●A104.21.7.1832026-02-26 → 2026-02-26 · 2 obs
● 2026-02-26 09:27:04
●A172.67.137.412026-02-26 → 2026-02-26 · 2 obs
● 2026-02-26 09:27:04
●A2606:4700:3033::6815:7b72026-02-26 → 2026-02-26 · 2 obs
● 2026-02-26 09:27:04
●A2606:4700:3037::ac43:89292026-02-26 → 2026-02-26 · 2 obs
● 2026-02-26 09:27:04
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| 21837c.com | sima.ns.cloudflare.com, sterling.ns.cloudflare.com | 12 records |
✅ Authoritative Response
Server: 108.162.192.222
NS records: sima.ns.cloudflare.com, sterling.ns.cloudflare.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for 21837c.com (unsigned zone)
⏱️ Timing
Total: 78ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 104.21.7.183, 172.67.137.41 |
| AAAA | 2 | 2606:4700:3033::6815:7b7, 2606:4700:3037::ac43:8929 |
| NS | 2 | sima.ns.cloudflare.com, sterling.ns.cloudflare.com |
| HTTPS | 1 | {"priority":1,"target":".","alpn":["h3", |
| SOA | 1 | sima.ns.cloudflare.com dns.cloudflare.co |
📌 Glue Records Collected
Total: 12
Out-of-bailiwick: 12 (sima.ns.cloudflare.com, sima.ns.cloudflare.com, sima.ns.cloudflare.com...)
AI analysis
Four IP numbers are pointed to by 21837c.com: 2606:4700:3033::6815:7b7, 2606:4700:3037::ac43:8929, 104.21.7.183 and 172.67.137.41.
other host names including www.lamgiftworld.com, pomeranian.org, wabenfilter.com, kayadev.com and engrhasan.com share IP numbers with 21837c.com.
21837c.com is delegated to two name servers sima.ns.cloudflare.com and sterling.ns.cloudflare.com.
21837c.com shares the same name server setup as other domains, for instance d97ea5.com, ec346b.com, 3656e3.com, 25651e.com and d1ec4.com.
21837c.com at least partially shares name servers with other domains, for instance factoll.com, 01yuanyi.com, docdog.top, seguinchildrensdental.com and haozhongweixiu.com.
These name servers are commonly used alongside kayleigh.ns.cloudflare.com and candy.ns.cloudflare.com.
Host names with six IP numbers:
Host name sima.ns.cloudflare.com points to: 2606:4700:50::adf5:3ade, 2803:f800:50::6ca2:c0de, 2a06:98c1:50::ac40:20de, 108.162.192.222, 172.64.32.222 and 173.245.58.222.
Host name sterling.ns.cloudflare.com points to: 2606:4700:58::a29f:2c8f, 2803:f800:50::6ca2:c38f, 2a06:98c1:50::ac40:238f, 108.162.195.143, 162.159.44.143 and 172.64.35.143.