`ostholz.com`

DNSSEC	⚠️ Not signed
A	81.88.34.83^{🇩🇪 CLOUDPIT81.88.32.0/20}
		PTR	`host195.alfahosting-server.de`
NS	`cns1.alfahosting.info` ⭐
		A	2a01:64c0:0:5000::8^{🇩🇪 CLOUDPIT2a01:64c0::/32}
			PTR	`cns1.cloudpit.de`
		A	109.237.142.8^{🇩🇪 CLOUDPIT109.237.128.0/20}
			PTR	`cns1.cloudpit.de`
NS	`cns2.alfahosting.info`
		A	2a01:4f8:2b02:a88::105^{🇩🇪 Hetzner2a01:4f8::/32 HETZNER-IPv6-BLK}
			PTR	`cns2.cloudpit.com`
		A	148.251.254.105^{🇩🇪 Hetzner148.251.0.0/16 HETZNER-RZ-BLK-ERX2}
			PTR	`cns2.cloudpit.com`
NS	`cns3.alfahosting.info`
		A	2a02:2b80:101:5000::8^{🇩🇪 CLOUDPIT2a02:2b80:101::/48}
			PTR	`cns3.cloudpit.io`
		A	109.237.143.8^{🇩🇪 CLOUDPIT109.237.128.0/20}
			PTR	`cns3.cloudpit.io`
MX	`mx03.secure-mailgate.com` ⭐
		A	46.243.88.174^{🇩🇪 CLOUDPIT46.243.88.0/21}
			PTR	`node03.secure-mailgate.com`
		A	46.243.88.176^{🇩🇪 CLOUDPIT46.243.88.0/21}
			PTR	`node04.secure-mailgate.com`
MX	`mx04.secure-mailgate.com` ⭐
		A	46.243.88.175^{🇩🇪 CLOUDPIT46.243.88.0/21}
			PTR	`node03.secure-mailgate.com`
		A	46.243.88.177^{🇩🇪 CLOUDPIT46.243.88.0/21}
			PTR	`node04.secure-mailgate.com`
SOA	`cns1.alfahosting.info`hostmaster@alfahosting.de 2026-01-15 #1

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1776014382

Subdomains

mail.ostholz.com

Same first word

ostholz.com

Similar names

shooltz.com

shooltz.net

zolhost.com

hztools.cn

DNS History

8 records (6 active, 2 former)

●NScns1.alfahosting.info2015-08-12 → 2026-04-12 · 2 obs

● 2015-08-12 10:27:10
● 2026-04-12 17:40:46

●NScns2.alfahosting.info2015-08-12 → 2026-04-12 · 2 obs

● 2015-08-12 10:27:10
● 2026-04-12 17:40:46

●NScns3.alfahosting.info2015-08-12 → 2026-04-12 · 2 obs

● 2015-08-12 10:27:10
● 2026-04-12 17:40:46

○MXmail.ostholz.com2015-08-12 → 2017-04-03 · 4 obs

● 2015-08-12 10:27:10
● 2017-04-03 22:14:40
○ 2026-04-12 16:44:20
○ 2026-04-12 17:40:46

●MXmx03.secure-mailgate.com2026-04-12 → 2026-04-12 · 3 obs

○ 2017-04-03 22:14:40
● 2026-04-12 16:44:20
● 2026-04-12 17:40:46

●MXmx04.secure-mailgate.com2026-04-12 → 2026-04-12 · 3 obs

○ 2017-04-03 22:14:40
● 2026-04-12 16:44:20
● 2026-04-12 17:40:46

○A109.237.134.82015-08-12 → 2017-04-03 · 4 obs

● 2015-08-12 10:27:10
● 2017-04-03 22:14:40
○ 2026-04-12 16:44:20
○ 2026-04-12 17:40:46

●A81.88.34.832026-04-12 → 2026-04-12 · 3 obs

○ 2017-04-03 22:14:40
● 2026-04-12 16:44:20
● 2026-04-12 17:40:46

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	h.gtld-servers.net, m.gtld-servers.net, d.gtld-servers.net, i.gtld-servers.net...	-
ostholz.com	cns3.alfahosting.info, cns2.alfahosting.info, cns1.alfahosting.info	-

✅ Authoritative Response

Server:148.251.254.105

NS records: cns3.alfahosting.info, cns2.alfahosting.info, cns1.alfahosting.info

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for ostholz.com (unsigned zone)

⏱️ Timing

Total: 738ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`81.88.34.83`
NS	3	`cns3.alfahosting.info, cns1.alfahosting.info...`
MX	2	`mx04.secure-mailgate.com (pri: 10), mx03.secure-mailgate.com (pri: 10)`
SOA	1	`cns1.alfahosting.info hostmaster.alfahos`

Analysis

Hierarchy

ostholz.com is parent of mail.ostholz.com.

IP Addresses

ostholz.com points to a single IP: 81.88.34.83.

Other host names, for instance mail.pro-position.com, mail.medino-gmbh.de, mail.tki.berlin, mail.clogs.de and bonn-solar.de share IP numbers with ostholz.com.

Name Servers

ostholz.com is delegated to three name servers: cns1.alfahosting.info, cns2.alfahosting.info and cns3.alfahosting.info.

ostholz.com at least partially shares its name servers with other domains, for instance tews24.de, wilfling-berlin.de, renke-korn.de, jadeg.de and profi-service.cz.