`net4cities.eu`

DNSSEC	⚠️ Not signed
A	139.17.228.40^{🇩🇪 DFN139.17.0.0/16 GFZ-LAN}
		PTR	`ce-conference.com`
		PTR	`wissenschaftsplattform2030.de`
		PTR	`wpn2030.de`
		PTR	`df-zukunftswerk.eu`
		PTR	`forumpourlavenir.eu`
		PTR	`net4cities.eu`
		PTR	`scarlet-project.eu`
		PTR	`ce-conference.info`
		PTR	`cobenefits.info`
		PTR	`ce-conference.net`
		PTR	`ama-project.org`
		PTR	`ce-conference.org`
		PTR	`co-create-arctic.org`
		PTR	`marineregionsforum.org`
		PTR	`potsdam-summer-school.org`
		PTR	`prog-ocean.org`
		PTR	`*.ce-conference.com`
		PTR	`rz-vm586.gfz.de`
		PTR	`klimawegweiser.rifs-potsdam.de`
		PTR	`*.wissenschaftsplattform2030.de`
		PTR	`*.wpn2030.de`
		PTR	`*.scarlet-project.eu`
		PTR	`*.ce-conference.info`
		PTR	`*.cobenefits.info`
		PTR	`*.ce-conference.net`
		PTR	`*.ama-project.org`
		PTR	`*.ce-conference.org`
		PTR	`*.co-create-arctic.org`
		PTR	`*.marineregionsforum.org`
		PTR	`*.potsdam-summer-school.org`
		PTR	`*.prog-ocean.org`
NS	`zrt7b.gfz-potsdam.de` ⭐
		A	139.17.228.229^{🇩🇪 DFN139.17.0.0/16 GFZ-LAN}
			PTR	`zrt7b.gfz-potsdam.de`
			PTR	`zrt7b.gfz.de`
NS	`deneb.dfn.de`
		A	2001:638:800:1::9^{🇩🇪 DFN2001:638::/32 -V6-AGG1}
			PTR	`deneb.dfn.de`
		A	192.76.176.9^{🇺🇸 DFN192.76.176.0/24 ZPL-NET}
			PTR	`deneb.dfn.de`
MX	`a1791.mx.srv.dfn.de` ⭐
		A	194.95.232.122^{🇩🇪 DFN194.94.0.0/15 -AGG-16}
			PTR	`a1791.mx.srv.dfn.de`
MX	`b1791.mx.srv.dfn.de` ⭐
		A	194.95.234.122^{🇩🇪 DFN194.94.0.0/15 -AGG-16}
			PTR	`b1791.mx.srv.dfn.de`
MX	`c1791.mx.srv.dfn.de` ⭐
		A	194.95.238.122^{🇩🇪 DFN194.94.0.0/15 -AGG-16}
			PTR	`c1791.mx.srv.dfn.de`
TXT	`HARICA-JVczhXp9QgNhnzknF3G`
TXT	`HARICA-QX6LBIVhD9T9L580ZKr`
TXT	`v=spf1 include:gfz-potsdam.de ~all`
SOA	`zrt7b.gfz-potsdam.de`its-ddi@gfz.de 2026-02-06 #0

`eu`

	DNSSEC	🔒 Signed (DS record present)
	NS	`si.dns.eu` ⭐
	NS	`be.dns.eu`
	NS	`w.dns.eu`
	NS	`x.dns.eu`
	NS	`y.dns.eu`
	SOA	`si.dns.eu`tech@eurid.eu serial=1124113183

PTR for

40.228.17.139.in-addr.arpa

DNS History

6 records (6 active, 0 former)

●NSdeneb.dfn.de2026-05-11 → 2026-05-11 · 2 obs

● 2026-05-11 18:39:20
● 2026-05-11 18:39:22

●NSzrt7b.gfz-potsdam.de2026-05-11 → 2026-05-11 · 2 obs

● 2026-05-11 18:39:20
● 2026-05-11 18:39:22

●MXa1791.mx.srv.dfn.de2026-05-11 → 2026-05-11 · 2 obs

● 2026-05-11 18:39:20
● 2026-05-11 18:39:22

●MXb1791.mx.srv.dfn.de2026-05-11 → 2026-05-11 · 2 obs

● 2026-05-11 18:39:20
● 2026-05-11 18:39:22

●MXc1791.mx.srv.dfn.de2026-05-11 → 2026-05-11 · 2 obs

● 2026-05-11 18:39:20
● 2026-05-11 18:39:22

●A139.17.228.402026-05-11 → 2026-05-11 · 2 obs

● 2026-05-11 18:39:20
● 2026-05-11 18:39:22

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
eu	w.dns.eu, x.dns.eu, y.dns.eu, be.dns.eu...	-
net4cities.eu	deneb.dfn.de, zrt7b.gfz-potsdam.de	-

✅ Authoritative Response

Server:192.76.176.9

NS records: deneb.dfn.de, zrt7b.gfz-potsdam.de

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for net4cities.eu (unsigned zone)

⏱️ Timing

Total: 763ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`139.17.228.40`
NS	2	`zrt7b.gfz-potsdam.de, deneb.dfn.de`
MX	3	`c1791.mx.srv.dfn.de (pri: 10), b1791.mx.srv.dfn.de (pri: 10)...`
TXT	3	`HARICA-JVczhXp9QgNhnzknF3G, HARICA-QX6LBIVhD9T9L580ZKr...`
SOA	1	`zrt7b.gfz-potsdam.de its-ddi.gfz.de`

Analysis

IP Addresses

net4cities.eu points to a single IP number: 139.17.228.40.

Other host names, for instance scarlet-project.eu, share IP numbers with net4cities.eu.

Name Servers

net4cities.eu is delegated to two name servers: deneb.dfn.de and zrt7b.gfz-potsdam.de.

net4cities.eu shares the same name server setup as other domains, for example emiw.org, g3p.eu, dews-online.org, helmholtz-gfz.de and cawa-project.net.