proofandreason.com - dns.ninja

`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=1786684569

Subdomains

mail.proofandreason.com

Same first word

proofandreason.com

DNS History

6 records (4 active, 2 former)

●NSns.web4u.cz2015-08-15 → 2026-08-14 · 2 obs

● 2015-08-15 09:41:42
● 2026-08-14 05:23:18

●NSns2.web4u.cz2015-08-15 → 2026-08-14 · 2 obs

● 2015-08-15 09:41:42
● 2026-08-14 05:23:18

○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
○ 2026-08-14 05:23:18

●MXmx.web4u.cz2026-03-24 → 2026-08-14 · 3 obs

○ 2017-07-04 15:51:10
● 2026-03-24 14:08:20
● 2026-08-14 05:23:18

●A193.85.154.1582026-03-24 → 2026-08-14 · 3 obs

○ 2017-07-04 15:51:10
● 2026-03-24 14:08:20
● 2026-08-14 05:23:18

○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
○ 2026-08-14 05:23:18

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, m.gtld-servers.net, a.gtld-servers.net, b.gtld-servers.net...	-
proofandreason.com	ns.web4u.cz, ns2.web4u.cz	-

✅ Authoritative Response

Server:85.207.53.12

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for proofandreason.com (unsigned zone)

⏱️ Timing

Total: 740ms | 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

Hierarchy

proofandreason.com serves as the parent of mail.proofandreason.com.

IP Addresses

proofandreason.com resolves to just one IP address, 193.85.154.158.

Host names like proofreason.eu are further examples that share IP numbers with proofandreason.com.

Name Servers

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

proofandreason.com shares its NS records with other domains, for example b2b-telephony.com, fintes.cz, rybnikar.org and two others.

ns2.web4u.cz and ns.web4u.cz both carry two IP addresses. The A records for ns2.web4u.cz are 85.207.53.12 and 2a02:a40:100:28ff::12; the A records for ns.web4u.cz are 185.14.224.241 and 2001:1568:fd::241.

Mail Servers

The sole mail server for proofandreason.com is mx.web4u.cz.

Among the domains sharing a mail server setup with proofandreason.com are cesiaplodnost.cz, perfectmodel.cz, vvd.cz and two others.

proofandreason.com uses mail servers that are also used by other domains, including lipovy.cz, elubra.cz and ssrkunice.cz.

These mail servers often co-occur with the mail servers zalozni.mail-server.cz.

mx.web4u.cz has two IP addresses: 81.91.87.12 and 2001:1568::7012.