`jeffreyclients.com`

DNSSEC	⚠️ Not signed
A	217.28.91.55^{🇨🇿 GREENDATA217.28.88.0/21}
NS	`ns1.regzone.cz` ⭐
		A	2a00:19a0:3:71:0:d9c6:710a:1^{🇨🇿 ZONER-AS2a00:19a0::/32 ZONER-IPV6-NET}
			PTR	`ns1.regzone.cz`
		A	217.198.113.10^{🇨🇿 ZONER-AS217.198.112.0/20 ZONER-NET}
			PTR	`ns1.regzone.cz`
NS	`ns1.regzone.de`
		A	2600:3c02::f03c:91ff:fedb:a6e7^{🇺🇸 AKAMAI-LINODE-AP2600:3c02::/32 Akamai Technologies}
			PTR	`ns1.regzone.de`
		A	23.92.29.43^{🇺🇸 AKAMAI-LINODE-AP23.92.28.0/22 Akamai Technologies}
			PTR	`ns1.regzone.de`
NS	`ns1.regzone.info`
		A	2001:1528:147::10^{🇨🇿 CASABLANCA-AS2001:1528::/32 Casablanca INT v6 network}
			PTR	`ns1.regzone.info`
		A	81.0.233.10^{🇨🇿 CASABLANCA-AS81.0.232.0/21 Casablanca INT}
			PTR	`ns1.regzone.info`
MX	`mail.isfgroup.cz` ⭐
		A	217.28.91.36^{🇨🇿 GREENDATA217.28.88.0/21}
			PTR	`mail.isfgroup.cz`
SOA	`ns1.regzone.cz`administrator@czechia.cz 2025-11-29 #4

`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.net`nstld@verisign-grs.com serial=1776115597

Same first word

jeffreyclients.com

DNS History

6 records (5 active, 1 former)

●NSns1.regzone.cz2018-08-16 → 2026-04-13 · 2 obs

● 2018-08-16 05:26:12
● 2026-04-13 21:28:58

●NSns1.regzone.de2018-08-16 → 2026-04-13 · 2 obs

● 2018-08-16 05:26:12
● 2026-04-13 21:28:58

●NSns1.regzone.info2018-08-16 → 2026-04-13 · 2 obs

● 2018-08-16 05:26:12
● 2026-04-13 21:28:58

●MXmail.isfgroup.cz2018-08-16 → 2026-04-13 · 2 obs

● 2018-08-16 05:26:12
● 2026-04-13 21:28:58

●A217.28.91.552026-02-16 → 2026-04-13 · 3 obs

○ 2018-08-16 05:26:12
● 2026-02-16 09:44:16
● 2026-04-13 21:28:58

○A95.168.211.42018-08-16 → 2018-08-16 · 3 obs

● 2018-08-16 05:26:12
○ 2026-02-16 09:44:16
○ 2026-04-13 21:28:58

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
jeffreyclients.com	ns1.regzone.info, ns1.regzone.cz, ns1.regzone.de	-

✅ Authoritative Response

Server:23.92.29.43

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for jeffreyclients.com (unsigned zone)

⏱️ Timing

Total: 499ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`217.28.91.55`
NS	3	`ns1.regzone.cz, ns1.regzone.de...`
MX	1	`mail.isfgroup.cz (pri: 10)`
SOA	1	`ns1.regzone.cz administrator.czechia.cz`

Analysis

IP Addresses

jeffreyclients.com points to a single IP number: 217.28.91.55.

Other host names such as dc6.cz and server-housing.cz share IP numbers with jeffreyclients.com.

Name Servers

The delegation for jeffreyclients.com is handled by three name servers: ns1.regzone.cz, ns1.regzone.de and ns1.regzone.info.

jeffreyclients.com at least partially shares name servers with other domains, for instance profihire.com, lesymost.cz, hols.cz, viphome.cz and praha1.city.

Two IP numbers per host:

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

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

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

Mail Servers

jeffreyclients.com is handled by a single mail server, mail.isfgroup.cz.

jeffreyclients.com uses the same mail server setup as other domains, such as isfgroup.cz, place4u.cz and alfresco.sk.

jeffreyclients.com shares some mail servers with other domains at least partially, for example bminvestment.cz.

these mail servers are often used with mail.corenet.cz and monty.corenet.cz.

mail.isfgroup.cz points to a single IP: 217.28.91.36.

jeffreyclients.com - robtex.com