offsec.nl - dns.ninja

`offsec.nl`

DNSSEC	🔒 Signed (DS record present)
A	2606:4700:3030::ac43:b494^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3035::6815:43cb^{🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.67.203^{Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.180.148^{🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`cory.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b5d^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`cory.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c15d^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`cory.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:215d^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`cory.ns.cloudflare.com`
		A	108.162.193.93^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`cory.ns.cloudflare.com`
		A	172.64.33.93^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`cory.ns.cloudflare.com`
		A	173.245.59.93^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`cory.ns.cloudflare.com`
NS	`kristin.ns.cloudflare.com`
		A	2606:4700:50::adf5:3ab5^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kristin.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c0b5^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`kristin.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:20b5^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`kristin.ns.cloudflare.com`
		A	108.162.192.181^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kristin.ns.cloudflare.com`
		A	172.64.32.181^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kristin.ns.cloudflare.com`
		A	173.245.58.181^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kristin.ns.cloudflare.com`
MX	`amir.mx.cloudflare.net` ⭐
		A	2606:4700:f5::11^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	2606:4700:f5::12^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	2606:4700:f5::13^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.11^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.12^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.13^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
MX	`linda.mx.cloudflare.net`⁽⁷³⁾
		A	2606:4700:f5::b^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	2606:4700:f5::c^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	2606:4700:f5::d^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route1.mx.cloudflare.net`
		A	162.159.205.23^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.24^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
		A	162.159.205.25^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route3.mx.cloudflare.net`
MX	`isaac.mx.cloudflare.net`⁽⁸²⁾
		A	2606:4700:f5::e^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	2606:4700:f5::f^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	2606:4700:f5::10^{🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.17^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.18^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
		A	162.159.205.19^{Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`route2.mx.cloudflare.net`
TXT	`sl-verification=utqjkrzreodzfkklggtlvqtzaivuhk`
TXT	`v=spf1 include:_spf.mx.cloudflare.net -all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.67.203, 172.67.180.148
		IPv6 hints	2606:4700:3030::ac43:b494, 2606:4700:3035::6815:43cb
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=162, name=cloudflare-ech.com
SOA	`cory.ns.cloudflare.com`dns@cloudflare.com serial=2406207471

`nl`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns1.dns.nl` ⭐
	NS	`ns3.dns.nl`
	NS	`ns4.dns.nl`
	TXT	`nl zone update: 2026-06-09 20:00:01 +0000 (EPOCH 1781035201)`
	SOA	`ns1.dns.nl`dns@sidn.nl 2026-06-09 #40

🔒 HSTS Preload (+subdomains)

Same first word

offsec.org

offsec.guru

offsec.nl

offsec.expert

offsec.one

offsec.co.uk

offsec.pl

offsec.de

offsec.ir

offsec.com

offsec.training

offsec.ru

offsec.us

offsec.tools

offsec.net

offsec.eu

offsec.me

Similar names

soceff.org

seffco.co.uk

sffeco.com

fesfoc.de

sffeco.com.sa

fesfoc.com

seffco.com

coffes.se

secoff.net

coseff.com

soceff.com

coffes.com

DNS History

19 records (9 active, 10 former)

●NScory.ns.cloudflare.com2026-02-28 → 2026-06-09 · 3 obs

○ 2017-05-14 11:58:28
● 2026-02-28 03:36:12
● 2026-06-09 21:00:50

●NSkristin.ns.cloudflare.com2026-02-28 → 2026-06-09 · 3 obs

○ 2017-05-14 11:58:28
● 2026-02-28 03:36:12
● 2026-06-09 21:00:50

○NSns1.metaregistrar.nl2017-05-14 → 2017-05-14 · 4 obs

○ 2016-11-04 15:07:38
● 2017-05-14 11:58:28
○ 2026-02-28 03:36:12
○ 2026-06-09 21:00:50

○NSns2.metaregistrar.nl2017-05-14 → 2017-05-14 · 4 obs

○ 2016-11-04 15:07:38
● 2017-05-14 11:58:28
○ 2026-02-28 03:36:12
○ 2026-06-09 21:00:50

○NSns3.firstfind.nl2015-08-17 → 2016-07-05 · 4 obs

● 2015-08-17 08:19:56
● 2016-07-05 08:02:34
○ 2016-11-04 15:07:38
○ 2026-06-09 21:00:50

○NSns4.firstfind.nl2015-08-17 → 2016-07-05 · 4 obs

● 2015-08-17 08:19:56
● 2016-07-05 08:02:34
○ 2016-11-04 15:07:38
○ 2026-06-09 21:00:50

○NSns5.firstfind.net2015-08-17 → 2016-07-05 · 4 obs

● 2015-08-17 08:19:56
● 2016-07-05 08:02:34
○ 2016-11-04 15:07:38
○ 2026-06-09 21:00:50

●MXamir.mx.cloudflare.net2026-02-28 → 2026-06-09 · 3 obs

○ 2016-11-04 15:07:38
● 2026-02-28 03:36:12
● 2026-06-09 21:00:50

●MXisaac.mx.cloudflare.net2026-02-28 → 2026-06-09 · 3 obs

○ 2016-11-04 15:07:38
● 2026-02-28 03:36:12
● 2026-06-09 21:00:50

●MXlinda.mx.cloudflare.net2026-02-28 → 2026-06-09 · 3 obs

○ 2016-11-04 15:07:38
● 2026-02-28 03:36:12
● 2026-06-09 21:00:50

○MXmail.offsec.nl2015-08-17 → 2016-07-05 · 4 obs

● 2015-08-17 08:19:56
● 2016-07-05 08:02:34
○ 2016-11-04 15:07:38
○ 2026-06-09 21:00:50

○MXmx1.firstfind.nl2015-08-17 → 2016-07-05 · 4 obs

● 2015-08-17 08:19:56
● 2016-07-05 08:02:34
○ 2016-11-04 15:07:38
○ 2026-06-09 21:00:50

○MXmx2.firstfind.nl2015-08-17 → 2016-07-05 · 4 obs

● 2015-08-17 08:19:56
● 2016-07-05 08:02:34
○ 2016-11-04 15:07:38
○ 2026-06-09 21:00:50

●A104.21.67.2032026-02-28 → 2026-06-09 · 3 obs

○ 2017-05-14 11:58:28
● 2026-02-28 03:36:12
● 2026-06-09 21:00:50

●A172.67.180.1482026-02-28 → 2026-06-09 · 3 obs

○ 2017-05-14 11:58:28
● 2026-02-28 03:36:12
● 2026-06-09 21:00:50

●A2606:4700:3030::ac43:b4942026-02-28 → 2026-06-09 · 3 obs

○ 2017-05-14 11:58:28
● 2026-02-28 03:36:12
● 2026-06-09 21:00:50

●A2606:4700:3035::6815:43cb2026-02-28 → 2026-06-09 · 3 obs

○ 2017-05-14 11:58:28
● 2026-02-28 03:36:12
● 2026-06-09 21:00:50

○A81.30.65.2312017-05-14 → 2017-05-14 · 4 obs

○ 2016-11-04 15:07:38
● 2017-05-14 11:58:28
○ 2026-02-28 03:36:12
○ 2026-06-09 21:00:50

○A82.173.135.1142015-08-17 → 2016-07-05 · 4 obs

● 2015-08-17 08:19:56
● 2016-07-05 08:02:34
○ 2016-11-04 15:07:38
○ 2026-06-09 21:00:50

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
nl	ns3.dns.nl, ns1.dns.nl, ns4.dns.nl	-
offsec.nl	cory.ns.cloudflare.com, kristin.ns.cloudflare.com	-

✅ Authoritative Response

Server:173.245.59.93

NS records: cory.ns.cloudflare.com, kristin.ns.cloudflare.com

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 652ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.67.203, 172.67.180.148`
AAAA	2	`2606:4700:3035::6815:43cb, 2606:4700:3030::ac43:b494`
NS	2	`cory.ns.cloudflare.com, kristin.ns.cloudflare.com`
MX	3	`amir.mx.cloudflare.net (pri: 37), linda.mx.cloudflare.net (pri: 73)...`
TXT	2	`sl-verification=utqjkrzreodzfkklggtlvqtz, v=spf1 include:_spf.mx.cloudflare.net -a`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`cory.ns.cloudflare.com dns.cloudflare.co`

Analysis

IP Addresses

offsec.nl resolves to 4 IP numbers: 104.21.67.203, 172.67.180.148, 2606:4700:3030::ac43:b494 and 2606:4700:3035::6815:43cb.

Additional host names — yummyplanet.es, xn--e1aajdapjjug1e1b.xn--p1ai, dartsweb.com and two others — share IP numbers with offsec.nl.

Name Servers

offsec.nl is delegated to two name servers: cory.ns.cloudflare.com and kristin.ns.cloudflare.com.

offsec.nl shares its name server setup with other domains, including dkbmed.com, echoworld.com, vse-chasti-filmov.ru and two others.

offsec.nl has at least partial name server overlap with other domains, such as arabtools.com, mn.systems, heuvelworks.click and two others.

It is common to see these name servers used together with name servers neil.ns.cloudflare.com and raquel.ns.cloudflare.com.

Host names with 6 IP numbers:

cory.ns.cloudflare.com has IP addresses 108.162.193.93, 172.64.33.93, 173.245.59.93 plus three more.

kristin.ns.cloudflare.com has IP addresses 108.162.192.181, 172.64.32.181, 173.245.58.181 plus three more.

Mail Servers

offsec.nl has three mail servers: amir.mx.cloudflare.net, isaac.mx.cloudflare.net and linda.mx.cloudflare.net.

offsec.nl shares mail servers — at least in part — with other domains, including fasty.ovh, linuxil.org, esnipe.com and two others.

Host names with 6 IP numbers:

amir.mx.cloudflare.net has IP addresses 162.159.205.11, 162.159.205.12, 162.159.205.13 plus three more.

isaac.mx.cloudflare.net has IP addresses 162.159.205.17, 162.159.205.18, 162.159.205.19 plus three more.

linda.mx.cloudflare.net has IP addresses 162.159.205.23, 162.159.205.24, 162.159.205.25 plus three more.