21red.cz - robtex.com
21red.cz
| DNSSEC | ⚠️ Not signed | ||||||
| A | 2606:4700:3031::ac43:da08🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 2606:4700:3035::6815:2616🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 104.21.38.22Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 172.67.218.8🇺🇸 Cloudflare172.67.208.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| NS | cory.ns.cloudflare.com ⭐ | ||||||
| A | 2606:4700:58::adf5:3b5d🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | cory.ns.cloudflare.com | ||||||
| A | 2803:f800:50::6ca2:c15d🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L | ||||||
| PTR | cory.ns.cloudflare.com | ||||||
| A | 2a06:98c1:50::ac40:215d🇺🇸 Cloudflare2a06:98c1:50::/45 | ||||||
| PTR | cory.ns.cloudflare.com | ||||||
| A | 108.162.193.93🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | cory.ns.cloudflare.com | ||||||
| A | 172.64.33.93🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | cory.ns.cloudflare.com | ||||||
| A | 173.245.59.93🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | cory.ns.cloudflare.com | ||||||
| NS | heidi.ns.cloudflare.com | ||||||
| A | 2606:4700:50::a29f:26ec🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | heidi.ns.cloudflare.com | ||||||
| A | 2803:f800:50::6ca2:c2ec🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L | ||||||
| PTR | heidi.ns.cloudflare.com | ||||||
| A | 2a06:98c1:50::ac40:22ec🇺🇸 Cloudflare2a06:98c1:50::/45 | ||||||
| PTR | heidi.ns.cloudflare.com | ||||||
| A | 108.162.194.236🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | heidi.ns.cloudflare.com | ||||||
| A | 162.159.38.236Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | heidi.ns.cloudflare.com | ||||||
| A | 172.64.34.236🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | heidi.ns.cloudflare.com | ||||||
| TXT | google-site-verification=OB1855uezqSUz2hzLu_dgDJs5e4RbMRGzw5vhLN1O9g | ||||||
| HTTPS | HTTP/3, HTTP/2 ✓ hints match | ||||||
| IPv4 hints | 104.21.38.22, 172.67.218.8 | ||||||
| IPv6 hints | 2606:4700:3031::ac43:da08, 2606:4700:3035::6815:2616 | ||||||
| ECH | X25519, HKDF-SHA256 + AES-128-GCM draft, id=218, name=cloudflare-ech.com | ||||||
| SOA | cory.ns.cloudflare.comdns@cloudflare.com serial=2401987558 | ||||||
cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.ns.nic.cz ⭐ | ||||||
| NS | b.ns.nic.cz | ||||||
| NS | c.ns.nic.cz | ||||||
| NS | d.ns.nic.cz | ||||||
| SOA | a.ns.nic.czhostmaster@nic.cz serial=1778728652 | ||||||
rank #4049 in the tld
Same first word
Similar names
DNS History
6 records (6 active, 0 former)
●NScory.ns.cloudflare.com2026-04-26 → 2026-05-14 · 2 obs
● 2026-05-14 03:41:38
●NSheidi.ns.cloudflare.com2026-04-26 → 2026-05-14 · 2 obs
● 2026-05-14 03:41:38
●A104.21.38.222026-04-26 → 2026-05-14 · 2 obs
● 2026-05-14 03:41:38
●A172.67.218.82026-04-26 → 2026-05-14 · 2 obs
● 2026-05-14 03:41:38
●A2606:4700:3031::ac43:da082026-04-26 → 2026-05-14 · 2 obs
● 2026-05-14 03:41:38
●A2606:4700:3035::6815:26162026-04-26 → 2026-05-14 · 2 obs
● 2026-05-14 03:41:38
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz, a.ns.nic.cz | - |
| 21red.cz | cory.ns.cloudflare.com, heidi.ns.cloudflare.com | - |
✅ Authoritative Response
Server:172.64.33.93
NS records: cory.ns.cloudflare.com, heidi.ns.cloudflare.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for 21red.cz (unsigned zone)
⏱️ Timing
Total: 2321ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 104.21.38.22, 172.67.218.8 |
| AAAA | 2 | 2606:4700:3031::ac43:da08, 2606:4700:3035::6815:2616 |
| NS | 2 | cory.ns.cloudflare.com, heidi.ns.cloudflare.com |
| TXT | 1 | google-site-verification=OB1855uezqSUz2h |
| HTTPS | 1 | {"priority":1,"target":".","alpn":["h3", |
| SOA | 1 | cory.ns.cloudflare.com dns.cloudflare.co |
Analysis
IP Addresses
21red.cz resolves to four IP numbers: 2606:4700:3031::ac43:da08, 2606:4700:3035::6815:2616, 104.21.38.22 and 172.67.218.8.
Other host names such as funyu.asia, checkout.guapprocess.com, www.spielzeugprada.de, webmail.grupo-ave.com and 5199jj.com share IPs with 21red.cz.
Name Servers
21red.cz is delegated to two name servers: cory.ns.cloudflare.com and heidi.ns.cloudflare.com.
21red.cz shares the same name server setup as bingoal-app.nl, haloinbox.com, reviewits.com, peachysunday.com and ludios-casino-nl.com.
21red.cz at least partially shares name servers with other domains, for instance tzanfz.eu.org, validacontrato.site, curtaincall.cloud, fasttrackcareerconsultants.com and idc2014.org.
These name servers are commonly used with aria.ns.cloudflare.com and raquel.ns.cloudflare.com.
Host names with six IP numbers:
cory.ns.cloudflare.com points to 2606:4700:58::adf5:3b5d, 2803:f800:50::6ca2:c15d, 2a06:98c1:50::ac40:215d, 108.162.193.93, 172.64.33.93 and 173.245.59.93.
heidi.ns.cloudflare.com points to 2606:4700:50::a29f:26ec, 2803:f800:50::6ca2:c2ec, 2a06:98c1:50::ac40:22ec, 108.162.194.236, 162.159.38.236 and 172.64.34.236.