`smtp2.cos.lu`

DNSSEC	⚠️ Not signed
MX	`mx00.ionos.de` ⭐
		A	212.227.15.41^{🇩🇪 IONOS-AS212.227.0.0/16 IONOS-PA-2}
			PTR	`mx00.kundenserver.de`
MX	`mx01.ionos.de` ⭐
		A	217.72.192.67^{🇩🇪 IONOS-AS217.72.192.0/20 Web.de}
			PTR	`mx01.kundenserver.de`

`cos.lu`

	DNSSEC	⚠️ Not signed
	A	2001:8d8:100f:f000::249^{🇩🇪 IONOS-AS2001:8d8::/32 DE-IONOS-20020910}
	A	217.160.0.247^{🇩🇪 IONOS-AS217.160.0.0/16 IONOS-PA-3}
	NS	`ns55.1und1.de` ⭐
	NS	`ns56.1und1.de`
	MX	`remote.cos.lu` ⭐
	TXT	`v=spf1 include:_spf.perfora.net include:_spf.kundenserver.de ip4:213.135.229....`
	SOA	`ns55.1und1.de`hostmaster@1und1.de 2017-03-31 #35

Previously MX for

cos.lu

audittracking.de

notestosharepoint.de

cos.de

Same first word

smtp2.pythonanywhere.com

smtp2.kinghost.net

smtp2.selfip.net

smtp2.sc.gov.br

smtp2.org

smtp2.gov.ee

smtp2.eu

smtp2.net

smtp2.jele.io

smtp2.gov.rs

smtp2.com

Similar names

2smtp.com

mtsp2.com

mt2sp.com

DNS History

6 records (2 active, 4 former)

●MXmx00.ionos.de2026-02-22 → 2026-05-11 · 3 obs

○ 2016-12-19 16:56:58
● 2026-02-22 22:41:48
● 2026-05-11 01:23:10

○MXmx00.kundenserver.de2008-12-02 → 2016-12-19 · 4 obs

● 2008-12-02 12:04:46
● 2016-12-19 16:56:58
○ 2026-02-22 22:41:48
○ 2026-05-11 01:23:10

●MXmx01.ionos.de2026-02-22 → 2026-05-11 · 3 obs

○ 2016-12-19 16:56:58
● 2026-02-22 22:41:48
● 2026-05-11 01:23:10

○MXmx01.kundenserver.de2008-12-02 → 2016-12-19 · 4 obs

● 2008-12-02 12:04:46
● 2016-12-19 16:56:58
○ 2026-02-22 22:41:48
○ 2026-05-11 01:23:10

○A194.154.196.822015-06-14 → 2016-12-19 · 5 obs

○ 2008-12-02 12:04:46
● 2015-06-14 13:06:10
● 2016-12-19 16:56:58
○ 2026-02-22 22:41:48
○ 2026-05-11 01:23:10

○A213.135.242.2262008-12-02 → 2008-12-02 · 3 obs

● 2008-12-02 12:04:46
○ 2015-06-14 13:06:10
○ 2026-05-11 01:23:10

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
lu	g.dns.lu, i.dns.lu, j.dns.lu, k.dns.lu...	12 records
cos.lu	ns55.1und1.de, ns56.1und1.de	-

✅ Authoritative Response

Server:217.160.82.33

NS records: ns55.1und1.de, ns56.1und1.de

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for cos.lu (unsigned zone)

⏱️ Timing

Total: 1341ms | Queries: -

📄 Records

Type	Count	Sample Data
MX	2	`mx00.ionos.de (pri: 10), mx01.ionos.de (pri: 10)`

📌 Glue Records Collected

Total: 12

In-bailiwick: 12 (g.dns.lu, i.dns.lu, j.dns.lu...)

Analysis

Mail Servers

Two mail servers handle smtp2.cos.lu: mx00.ionos.de and mx01.ionos.de.

smtp2.cos.lu shares the same mail server setup as other domains, including juprowa.eu, anpicon.de, badmintonboys.de, spirittravel.net and mittags-tipp.de.

Host names with one IP number:

mx00.ionos.de points to 212.227.15.41; mx01.ionos.de points to 217.72.192.67.

smtp2.cos.lu - robtex.com

smtp2.cos.lu

cos.lu