`proofandreason.com`

DNSSEC	⚠️ Not signed
A	193.85.154.158^{🇨🇿 TMOBILE-CZ193.85.0.0/16 T-Mobile Czech Republic a.s.}
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 2011-12-19 #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=1774724462

Same first word

proofandreason.com

DNS History

6 records (4 active, 2 former)

●NSns.web4u.cz2015-08-15 → 2026-03-28 · 2 obs

● 2015-08-15 09:41:42
● 2026-03-28 19:08:38

●NSns2.web4u.cz2015-08-15 → 2026-03-28 · 2 obs

● 2015-08-15 09:41:42
● 2026-03-28 19:08:38

○MXmail.proofandreason.com2015-08-15 → 2017-07-04 · 4 obs

● 2015-08-15 09:41:42
● 2017-07-04 15:51:10
○ 2026-03-24 14:08:20
○ 2026-03-28 19:08:38

●MXmx.web4u.cz2026-03-24 → 2026-03-28 · 3 obs

○ 2017-07-04 15:51:10
● 2026-03-24 14:08:20
● 2026-03-28 19:08:38

●A193.85.154.1582026-03-24 → 2026-03-28 · 3 obs

○ 2017-07-04 15:51:10
● 2026-03-24 14:08:20
● 2026-03-28 19:08:38

○A81.91.86.122015-08-15 → 2017-07-04 · 4 obs

● 2015-08-15 09:41:42
● 2017-07-04 15:51:10
○ 2026-03-24 14:08:20
○ 2026-03-28 19:08:38

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	j.gtld-servers.net, e.gtld-servers.net, i.gtld-servers.net, k.gtld-servers.net...	-
proofandreason.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 proofandreason.com (unsigned zone)

⏱️ Timing

Total: 902ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`193.85.154.158`
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

proofandreason.com points to an IP address: 193.85.154.158.

Name Servers

Two name servers ns2.web4u.cz and ns.web4u.cz handle the delegation for proofandreason.com.

proofandreason.com shares the same name server setup as other domains, for instance b2b-telephony.com, fintes.cz, rybnikar.org, beefcattle.cz and trachea-live.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

proofandreason.com is handled by a single mail server, mx.web4u.cz.

proofandreason.com uses the same mail server setup as other domains, for instance finesse.cz, perfectmodel.cz, fivetec.eu, vvd.cz and avemultimedia.cz.

proofandreason.com shares some mail servers with other domains, including lipovy.cz, elubra.cz, ssrkunice.cz and biza.info.

these mail servers are commonly used together with zalozni.mail-server.cz.

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

proofandreason.com - robtex.com