`larsenstrings.cz`

DNSSEC	🔒 Signed (DS record present)
A	81.91.86.11^{🇨🇿 WEB4U81.91.80.0/21}
		PTR	`php5.web4u.cz`
NS	`ns2.web4u.cz` ⭐
		A	2a02:a40:100:28ff::12^{🇨🇿 BlueTone-AS2a02:a40::/32 Ceske Radiokomunikace, a.s.}
			PTR	`ns2.web4u.cz`
		A	85.207.53.12^{🇨🇿 BlueTone-AS85.207.0.0/16 BlueTone-CRa-CZ Fourth address block}
			PTR	`ns2.web4u.cz`
NS	`ns.web4u.cz`
		A	2001:1568:fd::241^{🇨🇿 WEB4U2001:1568::/33}
			PTR	`ns.web4u.cz`
		A	185.14.224.241^{🇨🇿 WEB4U185.14.224.0/23}
			PTR	`ns.web4u.cz`
MX	`mx1.mailchannels.net` ⭐
		A	54.69.1.140^{🇺🇸 Amazon54.68.0.0/15 EC2 PDX Prefix}
			PTR	`ec2-54-69-1-140.us-west-2.compute.amazonaws.com`
MX	`mx2.mailchannels.net` ⭐
		A	18.236.29.166^{🇺🇸 Amazon18.236.0.0/15 EC2 PDX prefix}
			PTR	`ec2-18-236-29-166.us-west-2.compute.amazonaws.com`
SOA	`ns.web4u.cz`admin@web4u.cz 2025-05-04 #0

`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.cz`hostmaster@nic.cz serial=1774835236

Same first word

larsenstrings.cz

larsenstrings.com

DNS History

13 records (5 active, 8 former)

○NShosting.muzikus.cz2015-08-06 → 2015-11-30 · 4 obs

● 2015-08-06 08:41:54
● 2015-11-30 23:49:48
○ 2016-03-04 21:19:14
○ 2026-03-30 02:18:42

○NSlocal.muzikus.cz2015-08-06 → 2015-11-30 · 4 obs

● 2015-08-06 08:41:54
● 2015-11-30 23:49:48
○ 2016-03-04 21:19:14
○ 2026-03-30 02:18:42

●NSns.web4u.cz2016-03-04 → 2026-03-30 · 3 obs

○ 2015-11-30 23:49:48
● 2016-03-04 21:19:14
● 2026-03-30 02:18:42

●NSns2.web4u.cz2016-03-04 → 2026-03-30 · 3 obs

○ 2015-11-30 23:49:48
● 2016-03-04 21:19:14
● 2026-03-30 02:18:42

○NSrelay.muzikus.cz2015-08-06 → 2015-11-30 · 4 obs

● 2015-08-06 08:41:54
● 2015-11-30 23:49:48
○ 2016-03-04 21:19:14
○ 2026-03-30 02:18:42

○MXcaroly.czechrep.be2015-08-06 → 2015-11-30 · 4 obs

● 2015-08-06 08:41:54
● 2015-11-30 23:49:48
○ 2016-03-04 21:19:14
○ 2026-03-30 02:18:42

○MXhosting.muzikus.cz2015-08-06 → 2015-11-30 · 4 obs

● 2015-08-06 08:41:54
● 2015-11-30 23:49:48
○ 2016-03-04 21:19:14
○ 2026-03-30 02:18:42

○MXmail.larsenstrings.cz2016-03-04 → 2017-03-23 · 4 obs

○ 2015-11-30 23:49:48
● 2016-03-04 21:19:14
● 2017-03-23 05:56:56
○ 2026-03-30 02:18:42

●MXmx1.mailchannels.net2026-03-30 → 2026-03-30 · 2 obs

○ 2017-03-23 05:56:56
● 2026-03-30 02:18:42

●MXmx2.mailchannels.net2026-03-30 → 2026-03-30 · 2 obs

○ 2017-03-23 05:56:56
● 2026-03-30 02:18:42

○MXrelay.muzikus.cz2015-08-06 → 2015-11-30 · 4 obs

● 2015-08-06 08:41:54
● 2015-11-30 23:49:48
○ 2016-03-04 21:19:14
○ 2026-03-30 02:18:42

○A109.123.219.1372015-08-06 → 2015-11-30 · 4 obs

● 2015-08-06 08:41:54
● 2015-11-30 23:49:48
○ 2016-03-04 21:19:14
○ 2026-03-30 02:18:42

●A81.91.86.112016-03-04 → 2026-03-30 · 3 obs

○ 2015-11-30 23:49:48
● 2016-03-04 21:19:14
● 2026-03-30 02:18:42

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cz	a.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz	-
larsenstrings.cz	ns2.web4u.cz, ns.web4u.cz	4 records

✅ Authoritative Response

Server:85.207.53.12

NS records: ns2.web4u.cz, ns.web4u.cz

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 942ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`81.91.86.11`
NS	2	`ns.web4u.cz, ns2.web4u.cz`
MX	2	`mx1.mailchannels.net (pri: 10), mx2.mailchannels.net (pri: 10)`
SOA	1	`ns.web4u.cz admin.web4u.cz`

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (ns2.web4u.cz, ns.web4u.cz, ns2.web4u.cz...)

Analysis

IP Addresses

larsenstrings.cz points to a single IP number: 81.91.86.11.

other host names for instance extima.eu, unassigned-81-91-85-192.web4u.cz, unassigned-82-208-36-74.web4u.cz, ingersoll.cz and unassigned-81-91-83-241.web4u.cz share IP numbers with larsenstrings.cz.

Name Servers

larsenstrings.cz is delegated to two name servers: ns2.web4u.cz and ns.web4u.cz.

larsenstrings.cz shares the same name server setup as other domains, for example wobspot.com, velmarek.cz, otsukabrano.com, cpsolver.org and zsivancicka.cz.

Host names with two IP numbers:

ns2.web4u.cz points to 2a02:a40:100:28ff::12 and 85.207.53.12

ns.web4u.cz points to 2001:1568:fd::241 and 185.14.224.241

Mail Servers

larsenstrings.cz is handled by two mail servers: mx1.mailchannels.net and mx2.mailchannels.net.

larsenstrings.cz shares the same mail server setup as other domains, for instance mail.imaginaryunit.com, bakedbeancookies.net, asynchronous.org, mail.negshin.com and agaru.me.

larsenstrings.cz shares some mail servers with other domains at least partially, for example scienceandnature.co.uk.

Host names with one IP number:

The host mx1.mailchannels.net points to 54.69.1.140 and the host mx2.mailchannels.net points to 18.236.29.166.

larsenstrings.cz - robtex.com