cirkulum.cz - robtex.com

cirkulum.cz

DNSSEC⚠️ Not signed
A2606:4700:3033::ac43:c010🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3034::6815:b74🇺🇸 Cloudflare2606:4700:3034::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.11.116Cloudflare104.21.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.192.16🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSelsa.ns.cloudflare.com ⭐
A2606:4700:50::adf5:3a6f🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRelsa.ns.cloudflare.com
A2803:f800:50::6ca2:c06f🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRelsa.ns.cloudflare.com
A2a06:98c1:50::ac40:206f🇺🇸 Cloudflare2a06:98c1:50::/45
PTRelsa.ns.cloudflare.com
A108.162.192.111🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRelsa.ns.cloudflare.com
A172.64.32.111🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRelsa.ns.cloudflare.com
A173.245.58.111🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRelsa.ns.cloudflare.com
NSeric.ns.cloudflare.com
A2606:4700:58::adf5:3b70🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTReric.ns.cloudflare.com
A2803:f800:50::6ca2:c170🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTReric.ns.cloudflare.com
A2a06:98c1:50::ac40:2170🇺🇸 Cloudflare2a06:98c1:50::/45
PTReric.ns.cloudflare.com
A108.162.193.112🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTReric.ns.cloudflare.com
A172.64.33.112🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTReric.ns.cloudflare.com
A173.245.59.112🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTReric.ns.cloudflare.com
MXcirkulum-cz.mail.protection.outlook.com ⭐
A2a01:111:f403:ca04::a🇮🇪 Microsoft2a01:111:f000::/36
PTRmail-du0pr03cu00102.inbound.protection.outlook.com
A2a01:111:f403:ca04::c🇮🇪 Microsoft2a01:111:f000::/36
PTRmail-db9pr02cu00204.inbound.protection.outlook.com
A2a01:111:f403:ca09::🇳🇱 Microsoft2a01:111:f000::/36
PTRmail-am3pr04cu00500.inbound.protection.outlook.com
A2a01:111:f403:ca09::6🇳🇱 Microsoft2a01:111:f000::/36
PTRmail-am4pr0401cu00106.inbound.protection.outlook.com
A52.101.68.18🇮🇪 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-db4pr02cu00302.inbound.protection.outlook.com
A52.101.68.25🇮🇪 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-db8pr02cu00101.inbound.protection.outlook.com
A52.101.73.6🇳🇱 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-am6pr04cu00306.inbound.protection.outlook.com
A52.101.73.11🇳🇱 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-am1pr04cu00103.inbound.protection.outlook.com
TXTgoogle-site-verification=6pSYLuKnVSDqH7rbfV2x6iAjVDoHESgBqlE5Bzb1nYE
TXTv=spf1 mx a include:spf.reenio.cz include:spf.protection.outlook.com include:...
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4104.21.11.116, 172.67.192.16
IPv62606:4700:3033::ac43:c010, 2606:4700:3034::6815:b74
SOAelsa.ns.cloudflare.comdns@cloudflare.com serial=2396509369

cz

DNSSEC🔒 Signed (DS record present)
NSa.ns.nic.cz ⭐
NSb.ns.nic.cz
NSc.ns.nic.cz
NSd.ns.nic.cz
SOAa.ns.nic.czhostmaster@nic.cz serial=1774693035

Same first word

cirkulum.cz

DNS History

20 records (7 active, 13 former)

201820192020202120222023202420252026NSelsa.ns.cloudflare.comeric.ns.cloudflare.comns.vas-hosting.comns.vas-hosting.czns.vas-hosting.euns1.thinline.czns2.thinline.czns3.cesky-hosting.euMXcirkulum-cz.mail.protection.outlook.comalt1.aspmx.l.google.comaspmx.l.google.comaspmx2.googlemail.comA104.21.11.116172.67.192.162606:4700:3033::ac43:c0102606:4700:3034::6815:b742a00:1ed0:2:1:1:5bef:c918:12a01:28:ca:112::1:15288.86.119.6591.239.201.24
●NSelsa.ns.cloudflare.com2026-02-23 → 2026-03-28 · 3 obs
○ 2017-06-26 22:37:34
● 2026-02-23 02:48:24
● 2026-03-28 10:24:58
●NSeric.ns.cloudflare.com2026-02-23 → 2026-03-28 · 3 obs
○ 2017-06-26 22:37:34
● 2026-02-23 02:48:24
● 2026-03-28 10:24:58
○NSns.vas-hosting.com2026-02-23 → 2026-03-28 · 2 obs
○ 2026-02-23 02:48:24
○ 2026-03-28 10:24:58
○NSns.vas-hosting.cz2026-02-23 → 2026-03-28 · 2 obs
○ 2026-02-23 02:48:24
○ 2026-03-28 10:24:58
○NSns.vas-hosting.eu2026-02-23 → 2026-03-28 · 2 obs
○ 2026-02-23 02:48:24
○ 2026-03-28 10:24:58
○NSns1.thinline.cz2017-06-11 → 2017-06-26 · 4 obs
● 2017-06-11 23:50:34
● 2017-06-26 22:37:34
○ 2026-02-23 02:48:24
○ 2026-03-28 10:24:58
○NSns2.thinline.cz2017-06-11 → 2017-06-26 · 4 obs
● 2017-06-11 23:50:34
● 2017-06-26 22:37:34
○ 2026-02-23 02:48:24
○ 2026-03-28 10:24:58
○NSns3.cesky-hosting.eu2017-06-11 → 2017-06-26 · 4 obs
● 2017-06-11 23:50:34
● 2017-06-26 22:37:34
○ 2026-02-23 02:48:24
○ 2026-03-28 10:24:58
○MXalt1.aspmx.l.google.com2017-06-11 → 2017-06-26 · 4 obs
● 2017-06-11 23:50:34
● 2017-06-26 22:37:34
○ 2026-02-23 02:48:24
○ 2026-03-28 10:24:58
○MXaspmx.l.google.com2017-06-11 → 2017-06-26 · 4 obs
● 2017-06-11 23:50:34
● 2017-06-26 22:37:34
○ 2026-02-23 02:48:24
○ 2026-03-28 10:24:58
○MXaspmx2.googlemail.com2017-06-11 → 2017-06-26 · 4 obs
● 2017-06-11 23:50:34
● 2017-06-26 22:37:34
○ 2026-02-23 02:48:24
○ 2026-03-28 10:24:58
●MXcirkulum-cz.mail.protection.outlook.com2026-02-23 → 2026-03-28 · 3 obs
○ 2017-06-26 22:37:34
● 2026-02-23 02:48:24
● 2026-03-28 10:24:58
●A104.21.11.1162026-02-23 → 2026-03-28 · 3 obs
○ 2017-06-26 22:37:34
● 2026-02-23 02:48:24
● 2026-03-28 10:24:58
●A172.67.192.162026-02-23 → 2026-03-28 · 3 obs
○ 2017-06-26 22:37:34
● 2026-02-23 02:48:24
● 2026-03-28 10:24:58
●A2606:4700:3033::ac43:c0102026-02-23 → 2026-03-28 · 3 obs
○ 2017-06-26 22:37:34
● 2026-02-23 02:48:24
● 2026-03-28 10:24:58
●A2606:4700:3034::6815:b742026-02-23 → 2026-03-28 · 3 obs
○ 2017-06-26 22:37:34
● 2026-02-23 02:48:24
● 2026-03-28 10:24:58
○A2a00:1ed0:2:1:1:5bef:c918:12017-06-11 → 2017-06-26 · 4 obs
● 2017-06-11 23:50:34
● 2017-06-26 22:37:34
○ 2026-02-23 02:48:24
○ 2026-03-28 10:24:58
○A2a01:28:ca:112::1:1522026-02-23 → 2026-03-28 · 2 obs
○ 2026-02-23 02:48:24
○ 2026-03-28 10:24:58
○A88.86.119.652026-02-23 → 2026-03-28 · 2 obs
○ 2026-02-23 02:48:24
○ 2026-03-28 10:24:58
○A91.239.201.242017-06-11 → 2017-06-26 · 4 obs
● 2017-06-11 23:50:34
● 2017-06-26 22:37:34
○ 2026-02-23 02:48:24
○ 2026-03-28 10:24:58

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
cza.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz8 records
cirkulum.czelsa.ns.cloudflare.com, eric.ns.cloudflare.com-

✅ Authoritative Response

Server:173.245.59.112

NS records: elsa.ns.cloudflare.com, eric.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for cirkulum.cz (unsigned zone)

⏱️ Timing

Total: 1126ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.11.116, 172.67.192.16
AAAA22606:4700:3034::6815:b74, 2606:4700:3033::ac43:c010
NS2elsa.ns.cloudflare.com, eric.ns.cloudflare.com
MX1cirkulum-cz.mail.protection.outlook.com
TXT2google-site-verification=6pSYLuKnVSDqH7r, v=spf1 mx a include:spf.reenio.cz includ
HTTPS1{"priority":1,"target":".","alpn":["h3",
SOA1elsa.ns.cloudflare.com dns.cloudflare.co

📌 Glue Records Collected

Total: 8

In-bailiwick: 8 (a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz...)

Analysis

IP Addresses

cirkulum.cz maps to four IP numbers: 2606:4700:3033::ac43:c010, 2606:4700:3034::6815:b74, 104.21.11.116 and 172.67.192.16.

Other host names, for instance zjghszs.com, hazinedaroglu-group.com, xx5c.com, ocec-tj.com and yinengyoulu.com share IP numbers with cirkulum.cz.

Name Servers

Two name servers elsa.ns.cloudflare.com and eric.ns.cloudflare.com handle delegation for cirkulum.cz.

cirkulum.cz uses the same name server setup as other domains, for example gf-sut.ru, zacom.org, tapetsera.se, pizza-vesuvio-saintgermain.fr and txt.se.

cirkulum.cz partially shares name servers with other domains; examples include islandoutpost.com, gigahertz.fm, theoldschoolhouse.ie, sathihost.in and youthwant.com.tw.

these name servers are commonly used with the name servers pam.ns.cloudflare.com.

Host names with six IP numbers: elsa.ns.cloudflare.com points to: 2606:4700:50::adf5:3a6f, 2803:f800:50::6ca2:c06f, 2a06:98c1:50::ac40:206f, 108.162.192.111, 172.64.32.111 and 173.245.58.111; eric.ns.cloudflare.com points to: 2606:4700:58::adf5:3b70, 2803:f800:50::6ca2:c170, 2a06:98c1:50::ac40:2170, 108.162.193.112, 172.64.33.112 and 173.245.59.112.

Mail Servers

cirkulum.cz is handled by a single mail server, cirkulum-cz.mail.protection.outlook.com.

Hostname cirkulum-cz.mail.protection.outlook.com points to eight IP numbers: 2a01:111:f403:ca04::a, 2a01:111:f403:ca04::c, 2a01:111:f403:ca09::, 2a01:111:f403:ca09::6, 52.101.68.18, 52.101.68.25, 52.101.73.6 and 52.101.73.11.