mailer.20plus.cz - robtex.com

mailer.20plus.cz

DNSSEC⚠️ Not signed
A217.11.249.137🇨🇿 CASABLANCA-AS217.11.248.0/23 Casablanca INT
PTRtriton.blueboard.cz

20plus.cz

DNSSEC🔒 Signed (DS record present)
A217.11.249.137🇨🇿 CASABLANCA-AS217.11.248.0/23 Casablanca INT
NSshinzon.blueboard.cz ⭐
NSjaguar.blueboard.cz ⚠️ Not in zone NS records
NSns2.blueboard.cz
MXjaguar.blueboard.cz ⭐
TXTv=spf1 a mx include:spf.blueboard.cz -all
SOAshinzon.blueboard.czhostmaster@blueboard.cz 2023-06-15 #22

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DNS History

2 records (1 active, 1 former)

201820192020202120222023202420252026A217.11.249.13789.221.211.90
●A217.11.249.1372026-03-25 → 2026-07-11 · 3 obs
○ 2017-05-29 02:33:28
● 2026-03-25 16:13:30
● 2026-07-11 14:41:06
○A89.221.211.902017-05-29 → 2017-05-29 · 3 obs
● 2017-05-29 02:33:28
○ 2026-03-25 16:13:30
○ 2026-07-11 14:41:06

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
czd.ns.nic.cz, b.ns.nic.cz, a.ns.nic.cz, c.ns.nic.cz-
20plus.czns2.blueboard.cz, jaguar.blueboard.cz, shinzon.blueboard.cz3 records

✅ Authoritative Response

Server:178.251.187.8

NS records: ns2.blueboard.cz, jaguar.blueboard.cz, shinzon.blueboard.cz

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 590ms | Queries: -

📄 Records

TypeCountSample Data
A1217.11.249.137

📌 Glue Records Collected

Total: 3

Out-of-bailiwick: 3 (ns2.blueboard.cz, jaguar.blueboard.cz, shinzon.blueboard.cz)

Analysis

IP Addresses

mailer.20plus.cz resolves to just one IP address, 217.11.249.137.

Two other host names, along with bos-mail2.domains.chess.cz, via-ferrata.pl and lifestyleplus.cz, also share IP numbers with mailer.20plus.cz.