`codeunderground.nl`

DNSSEC	🔒 Signed (DS record present)
A	2606:4700:3033::6815:2518^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3035::ac43:cb49^{🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.37.24^{Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.203.73^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`lana.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3ab6^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lana.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c0b6^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`lana.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:20b6^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`lana.ns.cloudflare.com`
		A	108.162.192.182^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lana.ns.cloudflare.com`
		A	172.64.32.182^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lana.ns.cloudflare.com`
		A	173.245.58.182^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`lana.ns.cloudflare.com`
NS	`mack.ns.cloudflare.com`
		A	2606:4700:58::a29f:2c25^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`mack.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c325^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`mack.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2325^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`mack.ns.cloudflare.com`
		A	108.162.195.37^{🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`mack.ns.cloudflare.com`
		A	162.159.44.37^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`mack.ns.cloudflare.com`
		A	172.64.35.37^{🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`mack.ns.cloudflare.com`
MX	`mail.op-email.eu` ⭐
		A	34.13.213.173^{🇺🇸 Google34.13.128.0/17}
			PTR	`mail.op-email.eu`
TXT	`v=spf1 mx a -all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4	104.21.37.24, 172.67.203.73
		IPv6	2606:4700:3033::6815:2518, 2606:4700:3035::ac43:cb49
SOA	`lana.ns.cloudflare.com`dns@cloudflare.com serial=2399325647

`nl`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns1.dns.nl` ⭐ 🔒
	NS	`ns3.dns.nl` 🔒
	NS	`ns4.dns.nl` 🔒
	TXT	`nl zone update: 2026-03-15 06:00:02 +0000 (EPOCH 1773554402)`
	SOA	`ns1.dns.nl`dns@sidn.nl 2026-03-15 #12

🔒 HSTS Preload (+subdomains)

Same first word

codeunderground.nl

Similar names

undergroundcode.com

DNS History

15 records (7 active, 8 former)

●NSlana.ns.cloudflare.com2026-03-17 → 2026-03-24 · 3 obs

○ 2018-01-13 08:59:50
● 2026-03-17 17:55:50
● 2026-03-24 06:21:38

●NSmack.ns.cloudflare.com2026-03-17 → 2026-03-24 · 3 obs

○ 2018-01-13 08:59:50
● 2026-03-17 17:55:50
● 2026-03-24 06:21:38

○NSns0.transip.net2015-03-29 → 2018-01-13 · 4 obs

● 2015-03-29 00:35:26
● 2018-01-13 08:59:50
○ 2026-03-17 17:55:50
○ 2026-03-24 06:21:38

○NSns1.transip.nl2015-03-29 → 2018-01-13 · 4 obs

● 2015-03-29 00:35:26
● 2018-01-13 08:59:50
○ 2026-03-17 17:55:50
○ 2026-03-24 06:21:38

○NSns2.transip.eu2015-03-29 → 2018-01-13 · 4 obs

● 2015-03-29 00:35:26
● 2018-01-13 08:59:50
○ 2026-03-17 17:55:50
○ 2026-03-24 06:21:38

○MXmail.codeunderground.nl2015-03-29 → 2015-12-13 · 4 obs

● 2015-03-29 00:35:26
● 2015-12-13 20:21:42
○ 2016-03-21 06:28:02
○ 2026-03-24 06:21:38

●MXmail.op-email.eu2026-03-17 → 2026-03-24 · 3 obs

○ 2018-01-13 08:59:50
● 2026-03-17 17:55:50
● 2026-03-24 06:21:38

○MXmx.transip.email2016-03-21 → 2018-01-13 · 5 obs

○ 2015-12-13 20:21:42
● 2016-03-21 06:28:02
● 2018-01-13 08:59:50
○ 2026-03-17 17:55:50
○ 2026-03-24 06:21:38

○MXrelay.transip.nl2015-03-29 → 2015-12-13 · 4 obs

● 2015-03-29 00:35:26
● 2015-12-13 20:21:42
○ 2016-03-21 06:28:02
○ 2026-03-24 06:21:38

●A104.21.37.242026-03-17 → 2026-03-24 · 3 obs

○ 2018-01-13 08:59:50
● 2026-03-17 17:55:50
● 2026-03-24 06:21:38

●A172.67.203.732026-03-17 → 2026-03-24 · 3 obs

○ 2018-01-13 08:59:50
● 2026-03-17 17:55:50
● 2026-03-24 06:21:38

●A2606:4700:3033::6815:25182026-03-17 → 2026-03-24 · 3 obs

○ 2018-01-13 08:59:50
● 2026-03-17 17:55:50
● 2026-03-24 06:21:38

●A2606:4700:3035::ac43:cb492026-03-17 → 2026-03-24 · 3 obs

○ 2018-01-13 08:59:50
● 2026-03-17 17:55:50
● 2026-03-24 06:21:38

○A2a01:7c8:eb:0:95:170:70:1072015-03-29 → 2018-01-13 · 4 obs

● 2015-03-29 00:35:26
● 2018-01-13 08:59:50
○ 2026-03-17 17:55:50
○ 2026-03-24 06:21:38

○A95.170.70.1072015-03-29 → 2018-01-13 · 4 obs

● 2015-03-29 00:35:26
● 2018-01-13 08:59:50
○ 2026-03-17 17:55:50
○ 2026-03-24 06:21:38

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
nl	ns3.dns.nl, ns1.dns.nl, ns4.dns.nl	-
codeunderground.nl	lana.ns.cloudflare.com, mack.ns.cloudflare.com	-

✅ Authoritative Response

Server:173.245.58.182

NS records: lana.ns.cloudflare.com, mack.ns.cloudflare.com

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 683ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.37.24, 172.67.203.73`
AAAA	2	`2606:4700:3033::6815:2518, 2606:4700:3035::ac43:cb49`
NS	2	`lana.ns.cloudflare.com, mack.ns.cloudflare.com`
MX	1	`mail.op-email.eu (pri: 0)`
TXT	1	`v=spf1 mx a -all`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`lana.ns.cloudflare.com dns.cloudflare.co`

Analysis

IP Addresses

codeunderground.nl points to four IP numbers: 2606:4700:3033::6815:2518, 2606:4700:3035::ac43:cb49, 104.21.37.24 and 172.67.203.73.

Other host names, for instance www.fabulousnorth.com, codebox.ca, dw-games.com, bujur888jagoankitasemua.xyz and decasys.fi share IP numbers with codeunderground.nl.

Name Servers

codeunderground.nl's delegation is to two name servers lana.ns.cloudflare.com and mack.ns.cloudflare.com.

codeunderground.nl shares the same name server configuration as other domains, such as dekneu.nl, bk-installatietechniek.nl, krappekant.nl, 877866.xyz and scrub-supply.com.

codeunderground.nl at least partially shares its name servers with other domains, for instance thewbgroup.com, certlabel.com, grantvantage.com, lforen-cloud-trace.com and yibaow.com.

These name servers are commonly used alongside lovisa.ns.cloudflare.com and summer.ns.cloudflare.com.

Host names with six IP numbers:

lana.ns.cloudflare.com points to: 2606:4700:50::adf5:3ab6, 2803:f800:50::6ca2:c0b6, 2a06:98c1:50::ac40:20b6, 108.162.192.182, 172.64.32.182 and 173.245.58.182.

mack.ns.cloudflare.com points to: 2606:4700:58::a29f:2c25, 2803:f800:50::6ca2:c325, 2a06:98c1:50::ac40:2325, 108.162.195.37, 162.159.44.37 and 172.64.35.37.

Mail Servers

codeunderground.nl is served by a single mail server, mail.op-email.eu.

codeunderground.nl uses the same mail server setup as other domains such as kvlmedia.nl, procys.info, japanshop.nl, cpu.nl and andrewrobotham.com.

codeunderground.nl shares some mail servers with other domains, including kindia.be, as62000.net, webtcloud.com, one-page.com and mumuhosting.com.

mail.op-email.eu points to IP number 34.13.213.173.

codeunderground.nl - robtex.com