`cu-systems.de`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::6815:3e3e^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3031::ac43:dca6^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.62.62^{Cloudflare104.21.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.220.166^{🇺🇸 Cloudflare172.67.208.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`burt.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b4f^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`burt.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c14f^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`burt.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:214f^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`burt.ns.cloudflare.com`
		A	108.162.193.79^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`burt.ns.cloudflare.com`
		A	172.64.33.79^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`burt.ns.cloudflare.com`
		A	173.245.59.79^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`burt.ns.cloudflare.com`
NS	`zainab.ns.cloudflare.com`
		A	2606:4700:50::a29f:2695^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`zainab.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c295^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`zainab.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2295^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`zainab.ns.cloudflare.com`
		A	108.162.194.149^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`zainab.ns.cloudflare.com`
		A	162.159.38.149^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`zainab.ns.cloudflare.com`
		A	172.64.34.149^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`zainab.ns.cloudflare.com`
MX	`mail.cu-systems.de` ⭐
		A	188.68.47.59^{🇩🇪 netcup-AS188.68.47.0/24}
			PTR	`mx2f3b.netcup.net`
MX	`mx2f3b.netcup.net`⁽⁵⁰⁾
		A	188.68.47.59^{🇩🇪 netcup-AS188.68.47.0/24}
			PTR	`mx2f3b.netcup.net`
TXT	`v=spf1 mx a include:_spf.webhosting.systems ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.62.62, 172.67.220.166
		IPv6 hints	2606:4700:3030::6815:3e3e, 2606:4700:3031::ac43:dca6
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=168, name=cloudflare-ech.com
SOA	`burt.ns.cloudflare.com`dns@cloudflare.com serial=2403401086

`de`

	DNSSEC	🔒 Signed (DS record present)
	NS	`f.nic.de` ⭐
	NS	`a.nic.de`
	NS	`l.de.net` ⚠️ Not in parent delegation
	NS	`n.de.net` ⚠️ Not in parent delegation
	NS	`s.de.net` ⚠️ Not in parent delegation
	NS	`z.nic.de`
	SOA	`f.nic.de`dns-operations@denic.de serial=1778008766

Subdomains

mail.cu-systems.de

Same first word

cu-systems.de

DNS History

10 records (8 active, 2 former)

●NSburt.ns.cloudflare.com2026-02-24 → 2026-05-05 · 2 obs

● 2026-02-24 00:13:32
● 2026-05-05 19:29:40

●NSzainab.ns.cloudflare.com2026-02-24 → 2026-05-05 · 2 obs

● 2026-02-24 00:13:32
● 2026-05-05 19:29:40

●MXmail.cu-systems.de2026-02-24 → 2026-05-05 · 2 obs

● 2026-02-24 00:13:32
● 2026-05-05 19:29:40

●MXmx2f3b.netcup.net2026-02-24 → 2026-05-05 · 2 obs

● 2026-02-24 00:13:32
● 2026-05-05 19:29:40

●A104.21.62.622026-04-04 → 2026-05-05 · 3 obs

○ 2026-03-08 03:40:20
● 2026-04-04 14:56:04
● 2026-05-05 19:29:40

●A172.67.220.1662026-04-04 → 2026-05-05 · 3 obs

○ 2026-03-08 03:40:20
● 2026-04-04 14:56:04
● 2026-05-05 19:29:40

○A188.68.47.572026-02-24 → 2026-03-08 · 4 obs

● 2026-02-24 00:13:32
● 2026-03-08 03:40:20
○ 2026-04-04 14:56:04
○ 2026-05-05 19:29:40

●A2606:4700:3030::6815:3e3e2026-04-04 → 2026-05-05 · 3 obs

○ 2026-03-08 03:40:20
● 2026-04-04 14:56:04
● 2026-05-05 19:29:40

●A2606:4700:3031::ac43:dca62026-04-04 → 2026-05-05 · 3 obs

○ 2026-03-08 03:40:20
● 2026-04-04 14:56:04
● 2026-05-05 19:29:40

○A2a03:4000:61:5434::18:88352026-02-24 → 2026-03-08 · 4 obs

● 2026-02-24 00:13:32
● 2026-03-08 03:40:20
○ 2026-04-04 14:56:04
○ 2026-05-05 19:29:40

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
de	a.nic.de, f.nic.de, z.nic.de	-
cu-systems.de	burt.ns.cloudflare.com, zainab.ns.cloudflare.com	-

✅ Authoritative Response

Server:108.162.193.79

NS records: burt.ns.cloudflare.com, zainab.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for cu-systems.de (unsigned zone)

⏱️ Timing

Total: 2767ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.62.62, 172.67.220.166`
AAAA	2	`2606:4700:3031::ac43:dca6, 2606:4700:3030::6815:3e3e`
NS	2	`burt.ns.cloudflare.com, zainab.ns.cloudflare.com`
MX	2	`mail.cu-systems.de (pri: 10), mx2f3b.netcup.net (pri: 50)`
TXT	1	`v=spf1 mx a include:_spf.webhosting.syst`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`burt.ns.cloudflare.com dns.cloudflare.co`

Analysis

Hierarchy

mail.cu-systems.de has cu-systems.de as its parent.

IP Addresses

cu-systems.de maps to four IP numbers: 2606:4700:3030::6815:3e3e, 2606:4700:3031::ac43:dca6, 104.21.62.62 and 172.67.220.166.

Other host names, for instance hj25093f16.top, ubitquityx.com, balsamo.sp.gov.br, spock.anonops.ru and iltelefoninonline.anonops.ru share IP numbers with cu-systems.de.

Name Servers

Two name servers burt.ns.cloudflare.com and zainab.ns.cloudflare.com are delegated to cu-systems.de.

cu-systems.de uses the same name server configuration as other domains, such as newrewardzone.com, delget.com, squeakycleaningllc.com, offerteautousate.com and micka.me.

cu-systems.de at least partially shares name servers with other domains such as tuxihikimuscapitalco.click, efficiencyunited.com, cermv.info, stophatespeech.net and cubitolayer.click.

these name servers are commonly used with the name servers henry.ns.cloudflare.com.

Host names with six IP numbers: Host name burt.ns.cloudflare.com points to 2606:4700:58::adf5:3b4f, 2803:f800:50::6ca2:c14f, 2a06:98c1:50::ac40:214f, 108.162.193.79, 172.64.33.79 and 173.245.59.79; host name zainab.ns.cloudflare.com points to 2606:4700:50::a29f:2695, 2803:f800:50::6ca2:c295, 2a06:98c1:50::ac40:2295, 108.162.194.149, 162.159.38.149 and 172.64.34.149.

Mail Servers

Two mail servers handle cu-systems.de: mail.cu-systems.de and mx2f3b.netcup.net.

cu-systems.de shares mail servers with other domains at least in part, for instance nikosik.de, plate-gt.de, eisenbahn-archiv.org, mgow.de and scirocco53b.de.

these mail servers are commonly used alongside the mail servers mail.tangomarathons.com.

Hostnames with one IP number:

mail.cu-systems.de points to 188.68.47.59

mx2f3b.netcup.net points to 188.68.47.59

Hostnames pointing to 188.68.47.59: mail.cu-systems.de, mx2f3b.netcup.net

cu-systems.de - robtex.com

cu-systems.de

de

Subdomains

Same first word

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

Analysis

Hierarchy

IP Addresses

Name Servers

Mail Servers

`cu-systems.de`

`de`