back.cz - robtex.com

back.cz

DNSSEC🔒 Signed (DS record present)
A2a00:19a0:3:72:0:d9c6:72b7:1🇨🇿 ZONER-AS2a00:19a0::/32 ZONER-IPV6-NET
PTRfenrir.zarea.net
A217.198.114.183🇨🇿 ZONER-AS217.198.112.0/20 ZONER-NET
NSns1.regzone.cz ⭐
A2a00:19a0:3:71:0:d9c6:710a:1🇨🇿 ZONER-AS2a00:19a0::/32 ZONER-IPV6-NET
PTRns1.regzone.cz
A217.198.113.10🇨🇿 ZONER-AS217.198.112.0/20 ZONER-NET
PTRns1.regzone.cz
NSns1.regzone.de
A2600:3c02::f03c:91ff:fedb:a6e7🇺🇸 AKAMAI-LINODE-AP2600:3c02::/32 Akamai Technologies
PTRns1.regzone.de
A23.92.29.43🇺🇸 AKAMAI-LINODE-AP23.92.28.0/22 Akamai Technologies
PTRns1.regzone.de
NSns1.regzone.info
A2001:1528:147::10🇨🇿 CASABLANCA-AS2001:1528::/32 Casablanca INT v6 network
PTRns1.regzone.info
A81.0.233.10🇨🇿 CASABLANCA-AS81.0.232.0/21 Casablanca INT
PTRns1.regzone.info
MXrelay.zoner.com ⭐
A217.198.120.100🇨🇿 ZONER-AS217.198.112.0/20 ZONER-NET
PTRrelay.zoner.com
MX10mx.zoner.com(10)
A217.198.120.36🇨🇿 ZONER-AS217.198.112.0/20 ZONER-NET
PTR10mx.zoner.com
MX15mx.zoner.com(15)
A81.0.233.6🇨🇿 CASABLANCA-AS81.0.232.0/21 Casablanca INT
PTR15mx.zoner.com
SOAns1.regzone.czadministrator@czechia.cz 2026-02-08 #6

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=1771291036

Same first word

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back.asia
back.dk
back.bio
back.nu
back.be
back.ch
back.solutions
back.cl
back.im
back.biz
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back.lu
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back.pt
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back.engineering
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back.tw
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back.no
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back.ax
back.zone
back.schule
back.is
back.ws
back.ly
back.to
back.ro
back.fr
back.com
back.by
back.cloudns.cx

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ackb.com
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akcb.de
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kabc.or.kr
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bkac.cn
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kabc.nl
kcab.net
bcak.de
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kbca.org
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cbak.net

DNS History

10 records (8 active, 2 former)

20162017201820192020202120222023202420252026NSns1.regzone.czns1.regzone.dens1.regzone.infoMX10mx.zoner.com15mx.zoner.comrelay.zoner.comA217.198.114.1832a00:19a0:3:72:0:d9c6:72b7:1217.198.114.1092a00:19a0:3:72:0:d9c6:726d:1
●NSns1.regzone.cz2015-07-08 → 2026-02-28 · 2 obs
● 2015-07-08 15:46:40
● 2026-02-28 11:47:48
●NSns1.regzone.de2015-07-08 → 2026-02-28 · 2 obs
● 2015-07-08 15:46:40
● 2026-02-28 11:47:48
●NSns1.regzone.info2015-07-08 → 2026-02-28 · 2 obs
● 2015-07-08 15:46:40
● 2026-02-28 11:47:48
●MX10mx.zoner.com2015-07-08 → 2026-02-28 · 2 obs
● 2015-07-08 15:46:40
● 2026-02-28 11:47:48
●MX15mx.zoner.com2015-07-08 → 2026-02-28 · 2 obs
● 2015-07-08 15:46:40
● 2026-02-28 11:47:48
●MXrelay.zoner.com2015-07-08 → 2026-02-28 · 2 obs
● 2015-07-08 15:46:40
● 2026-02-28 11:47:48
○A217.198.114.1092015-07-08 → 2016-11-27 · 4 obs
● 2015-07-08 15:46:40
● 2016-11-27 05:29:58
○ 2026-02-28 04:30:56
○ 2026-02-28 11:47:48
●A217.198.114.1832026-02-28 → 2026-02-28 · 3 obs
○ 2016-11-27 05:29:58
● 2026-02-28 04:30:56
● 2026-02-28 11:47:48
○A2a00:19a0:3:72:0:d9c6:726d:12015-07-08 → 2016-11-27 · 4 obs
● 2015-07-08 15:46:40
● 2016-11-27 05:29:58
○ 2026-02-28 04:30:56
○ 2026-02-28 11:47:48
●A2a00:19a0:3:72:0:d9c6:72b7:12026-02-28 → 2026-02-28 · 3 obs
○ 2016-11-27 05:29:58
● 2026-02-28 04:30:56
● 2026-02-28 11:47:48

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
cza.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz-
back.czns1.regzone.de, ns1.regzone.info, ns1.regzone.cz2 records

✅ Authoritative Response

Server: 23.92.29.43

NS records: ns1.regzone.de, ns1.regzone.info, ns1.regzone.cz

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 1094ms | Queries: -

📄 Records

TypeCountSample Data
A1217.198.114.183
AAAA12a00:19a0:3:72:0:d9c6:72b7:1
NS3ns1.regzone.cz, ns1.regzone.de...
MX3relay.zoner.com (pri: 1), 10mx.zoner.com (pri: 10)...
SOA1ns1.regzone.cz administrator.czechia.cz

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns1.regzone.cz, ns1.regzone.cz)

AI analysis

back.cz resolves to two IP numbers: 2a00:19a0:3:72:0:d9c6:72b7:1 and 217.198.114.183.

Other host names, for instance storkan.cz, perk.cz, bbhcz.cz, sdpharma.cz and stavebni-silnicni-stroje.cz share IP numbers with back.cz.

back.cz delegates to three name servers: ns1.regzone.cz, ns1.regzone.de and ns1.regzone.info.

back.cz shares some name servers with other domains, for example hotelpetr.cz, talend.cz, dolbe.cz, ritz.cz and idigital.cz.

Host names with two IP numbers:

ns1.regzone.cz: 2a00:19a0:3:71:0:d9c6:710a:1 and 217.198.113.10

ns1.regzone.de: 2600:3c02::f03c:91ff:fedb:a6e7 and 23.92.29.43

ns1.regzone.info: 2001:1528:147::10 and 81.0.233.10

back.cz is handled by three mail servers: 10mx.zoner.com, 15mx.zoner.com and relay.zoner.com.

back.cz shares some mail servers with other domains, at least partially; for instance arol.cz, spiraxsarco.cz, raindance.cz, ahmadtea.cz and microrisc.cz.

Host names with a single IP: 10mx.zoner.com points to 217.198.120.36; 15mx.zoner.com points to 81.0.233.6; relay.zoner.com points to 217.198.120.100.