`smtp.3u.net`

DNSSEC	⚠️ Not signed
A	81.209.151.4^{🇩🇪 UUU-TELECOM-AS81.209.151.0/24}
		PTR	`smtp.3u.net`
TXT	`v=spf1 a:smtp.3u.net ip4:81.209.151.4 -all`

`3u.net`

	DNSSEC	⚠️ Not signed
	A	2a01:4f8:d0a:43b8::2^{🇩🇪 Hetzner2a01:4f8::/32 HETZNER-IPv6-BLK}
	A	78.47.62.47^{🇩🇪 Hetzner78.46.0.0/15 HETZNER-RZ-NBG-BLK5}
	NS	`ns1.3u.net` ⭐
	NS	`ns2.3u.net`
	MX	`3u-net.mail.protection.outlook.com` ⭐
	TXT	`v=spf1 a:smtp.3u.net ip4:81.209.151.4 include:spf.protection.outlook.com incl...`
	TXT	`apple-domain-verification=j0SKcmelUoD65pUn`
	TXT	`MS=ms26206165`
	TXT	`google-site-verification=Yqhgv4PJ4AETV-61XiZr49eZoCLnBeq8B1KJPmLOwxU`
	SOA	`ns1.3u.net`ops@3u.net 2026-04-17 #1

WOT: SAFE (60/100)
📈 Tranco rank: #45,583

PTR for

4.151.209.81.in-addr.arpa

MX for

Previously MX for

01086.com

climalevel.com

weclapp.net

exacor.de

weclapp.eu

weclap.de

3uenergy.de

climalevel.de

3u-dcs.de

fon4u.de

weclapp.in

selfio.com

3utelecom.at

selfio.at

weclapp.com

3u.net

selfio.ch

weclapp.us

angebotsvorlage.de

weclapp.nl

selfio.de

vienna-collect.at

weclapp.info

weclapp.org

3udynamics.de

risima.de

3umobile.net

linecall.de

onetel.de

weclapp.ch

immowerker.de

Same first word

smtp.fr

smtp.store

smtp.gratis

smtp.co.at

smtp.gov.ps

smtp.gov.rs

smtp.eu.org

smtp.sc.gov.br

smtp.in-berlin.de

smtp.appengine.flow.ch

smtp.kinghost.net

smtp.org

smtp.es-1.axarnet.cloud

smtp.co.kr

smtp.(0x787878)

smtp.co.nz

smtp.kz

smtp.com.tr

smtp.jcloud.kz

smtp.sp.gov.br

smtp.net.ru

smtp.edu.ee

smtp.j.layershift.co.uk

smtp.net.ua

smtp.hu

smtp.mail.pl

smtp.iki.fi

smtp.org.uk

smtp.at

smtp.com.au

smtp.tv

smtp.vg

smtp.ox.rs

smtp.co

smtp.su

smtp.net

smtp.dk

smtp.guru

smtp.io

smtp.cz

smtp.dedibox.fr

smtp.net.in

smtp.network

smtp.co.il

smtp.si

smtp.software

smtp.com.es

smtp.nhs.uk

smtp.ch

smtp.zone

smtp.pub

smtp.hosting

smtp.nu

smtp.tj

smtp.tools

smtp.com

smtp.com.mx

smtp.sk

smtp.co.hu

smtp.ws

smtp.uni5.net

smtp.jc.neen.it

smtp.vn

smtp.to

smtp.mircloud.host

smtp.demo.jelastic.com

smtp.gouv.km

smtp.hotmail

smtp.com.ph

smtp.be

smtp.nz

smtp.moe

smtp.re

smtp.ms

smtp.ca

smtp.paas.datacenter.fi

smtp.fm

smtp.co.ke

smtp.lt

smtp.fi.cloudplatform.fi

smtp.de

smtp.services

smtp.live

smtp.fi

smtp.uk

smtp.or.tz

smtp.cloudaccess.net

smtp.cat

smtp.az

smtp.dev

smtp.unicloud.pl

smtp.paas.massivegrid.com

smtp.mil.tw

smtp.it

smtp.solutions

smtp.pythonanywhere.com

smtp.li

smtp.ru

smtp.se

smtp.co.za

smtp.mydns.jp

smtp.gc.ca

smtp.me

smtp.fi.it

smtp.rs.gov.br

smtp.gov.ru

smtp.business

smtp.ooo

smtp.jelastic.saveincloud.net

smtp.in

smtp.net.au

smtp.to.gov.br

smtp.com.br

smtp.fun

smtp.agency

smtp.pt

smtp.myshopify.com

smtp.ee

smtp.im

smtp.jelastic.dogado.eu

smtp.lat

smtp.cl

smtp.mk

smtp.lu

smtp.id

smtp.eu

smtp.fail

smtp.bz

smtp.ro

smtp.pl

smtp.goog

smtp.news

smtp.j.scaleforce.net

smtp.lv

Similar names

mstp.ca

mstp.fr

stpm.net

tsmp.cn

tmsp.jp

pmts.ph

tpms.mobi

mpst.ru

mtps.in

ptms.us

tsmp.club

tmps.nl

tsmp.com.au

stmp.nl

tpms.vn

tsmp.jp

tsmp.de

tpsm.co.uk

mpst.net

mtps.gov.br

pmts.fr

tpms.co.uk

ptsm.eu

stmp.co

tsmp.com

mspt.sk

spmt.cn

stpm.org

tmps.info

ptsm.us

mtsp.eu

ptms.com.my

tsmp.net

tsmp.eu

smpt.eu

pmts.com

tsmp.com.br

smpt.tk

tpms.dk

pmst.org

sptm.eu

ptms.net

stpm.pl

pstm.ru

pmst.ir

pstm.at

mpst.eu

stpm.ca

tmsp.no-ip.org

ptsm.ru

ptms.in

spmt.org

stpm.de

pstm.org

tpms.co.in

tmsp.email

sptm.org

mtsp.biz

tmsp.org

ptms.eu

pmst.cn

tmsp.ru

mpts.com.qa

mstp.net

mtsp.de

ptms.org

pmts.dk

mspt.com

mpst.at

DNS History

1 record (1 active, 0 former)

●A81.209.151.42015-06-23 → 2026-05-10 · 2 obs

● 2015-06-23 18:18:12
● 2026-05-10 02:20:40

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
net	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
3u.net	ns1.3u.net, ns2.3u.net	2 records

✅ Authoritative Response

Server:83.125.107.34

NS records: ns1.3u.net, ns2.3u.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 3u.net (unsigned zone)

⏱️ Timing

Total: 663ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`81.209.151.4`
TXT	1	`v=spf1 a:smtp.3u.net ip4:81.209.151.4 -a`

📌 Glue Records Collected

Total: 2

In-bailiwick: 2 (ns1.3u.net, ns2.3u.net)

Analysis

Mail Server Role

smtp.3u.net serves as the mail server for selfio.tv, 3u-energy.de, fussbodenheizung-online.de, 3usolarkraftwerk.de, euro-sun-solar.com and a few other domains.

IP Addresses

smtp.3u.net points to a single IP: 81.209.151.4.

smtp.3u.net - robtex.com

smtp.3u.net

3u.net