`mx20.bieringer.de`

CNAME	`co1.bieringer.net`
DNSSEC	⚠️ Not signed
A	2a02:c207:3005:9207::1^{🇩🇪 CONTABO2a02:c207::/32}
		PTR	`co1.bieringer.net`
A	5.189.185.206^{🇩🇪 CONTABO5.189.176.0/20}
MX	`co1.bieringer.net` ⭐
		A	2a02:c207:3005:9207::1^{🇩🇪 CONTABO2a02:c207::/32}
			PTR	`co1.bieringer.net`
		A	5.189.185.206^{🇩🇪 CONTABO5.189.176.0/20}
			PTR	`co1.bieringer.net`
TXT	`v=spf1 ip4:5.189.185.206 ip6:2a02:c207:3005:9207::1 mx -all`

`bieringer.de`

	DNSSEC	⚠️ Not signed
	NS	`ns1.first-ns.de` ⭐
	NS	`robotns2.second-ns.de`
	NS	`robotns3.second-ns.com`
	MX	`co2.bieringer.net` ⭐
	TXT	`v=spf1 ip4:5.189.185.206 ip6:2a02:c207:3005:9207::1 ip4:158.220.124.161 ip6:2...`
	SOA	`ns1.first-ns.de`hostmaster@bieringer.de 2026-04-23 #14

WOT: SAFE (60/100)
rank #585434 globally
rank #19938 in the tld
WOT: SAFE (62/100)

MX for

bieringer.org

Same first word

mx20.com

mx20.org

mx20.de

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20xm.com

02xm.com

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mx02.gov.jo

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02xm.top

mx02.123hjemmeside.dk

m20x.com

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xm20.com

DNS History

1 record (1 active, 0 former)

●CNAMEco1.bieringer.net2026-03-29 → 2026-04-26 · 2 obs

● 2026-03-29 14:46:34
● 2026-04-26 05:28:28

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
de	a.nic.de, f.nic.de, z.nic.de	-
bieringer.de	ns1.first-ns.de, robotns2.second-ns.de, robotns3.second-ns.com	-

✅ Authoritative Response

Server:193.47.99.3

NS records: ns1.first-ns.de, robotns2.second-ns.de, robotns3.second-ns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for bieringer.de (unsigned zone)

⏱️ Timing

Total: 1287ms | Queries: -

📄 Records

Type	Count	Sample Data
CNAME	1	`co1.bieringer.net`

Analysis

Mail Server Role

mx20.bieringer.de serves as the mail server for bieringer.org.

mx40.bieringer.de often functions as the mail server, commonly paired with mx20.bieringer.de.

IP Addresses

mx20.bieringer.de points to two IP numbers: 2a02:c207:3005:9207::1 and 5.189.185.206.

Other host names, for instance co1.bieringer.net, share IP numbers with mx20.bieringer.de.

Mail Servers

The mail server for mx20.bieringer.de is co1.bieringer.net.

mx20.bieringer.de shares the same mail server setup as other domains, for instance co1.bieringer.net.

Some mail servers are shared between mx20.bieringer.de and other domains, for instance bieringer.net.

these mail servers are frequently used alongside the mail servers co2.bieringer.net.

Hostname co1.bieringer.net resolves to two IPs: 2a02:c207:3005:9207::1 and 5.189.185.206.

mx20.bieringer.de - robtex.com