`astra-security.com`

DNSSEC	⚠️ Not signed
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	`mx.web4u.cz` ⭐
		A	2001:1568::7012^{🇨🇿 WEB4U2001:1568::/33}
			PTR	`mx.web4u.cz`
		A	81.91.87.12^{🇨🇿 WEB4U81.91.80.0/21}
			PTR	`mx.web4u.cz`
SOA	`ns.web4u.cz`admin@web4u.cz 2010-10-07 #1

`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=1774646002

Same first word

astra-security.eu

astra-security.net

astra-security.com

DNS History

5 records (4 active, 1 former)

●NSns.web4u.cz2015-05-16 → 2026-03-27 · 2 obs

● 2015-05-16 10:46:00
● 2026-03-27 21:38:22

●NSns2.web4u.cz2015-05-16 → 2026-03-27 · 2 obs

● 2015-05-16 10:46:00
● 2026-03-27 21:38:22

○MXmail.astra-security.com2015-05-16 → 2017-06-10 · 3 obs

● 2015-05-16 10:46:00
● 2017-06-10 19:49:56
○ 2026-03-27 21:38:22

●MXmx.web4u.cz2026-03-27 → 2026-03-27 · 2 obs

○ 2017-06-10 19:49:56
● 2026-03-27 21:38:22

●A81.91.86.112015-05-16 → 2026-03-27 · 2 obs

● 2015-05-16 10:46:00
● 2026-03-27 21:38:22

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
astra-security.com	ns.web4u.cz, ns2.web4u.cz	-

✅ Authoritative Response

Server:185.14.224.241

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for astra-security.com (unsigned zone)

⏱️ Timing

Total: 789ms | Queries: -

📄 Records

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

Analysis

IP Addresses

astra-security.com resolves to a single IP address: 81.91.86.11.

Other host names including nerware.cz, vales.org, unassigned-81-91-80-141.web4u.cz, unassigned-81-91-84-108.web4u.cz and unassigned-82-208-36-222.web4u.cz share IP numbers with astra-security.com.

Name Servers

astra-security.com's delegation uses two name servers, ns2.web4u.cz and ns.web4u.cz.

astra-security.com shares the same name server setup as other domains, for example kovozal.eu, vyoralkova.cz, balas.cz, axero.cz and animalpoint.cz.

Host names with two IPs:

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

astra-security.com is handled by a single mail server, mx.web4u.cz.

astra-security.com shares its mail server setup with other domains, including intermac.cz, znouzectnost.cz, vizor.cz, formotion.cz and lokoc.com.

astra-security.com shares some mail servers with other domains, for example jp1.cz and lascort.cz.

mx.web4u.cz points to two IPs: 2001:1568::7012 and 81.91.87.12.

astra-security.com - robtex.com