`calculus-software.nl`

DNSSEC	🔒 Signed (DS record present)
A	2001:1690:2:4::1:114^{🇳🇱 PREVIDER-AS2001:1690::/32 NL-PREVIDER-IPV6}
		PTR	`vserver04.previder.nl`
A	80.65.96.114^{🇳🇱 PREVIDER-AS80.65.96.0/19 Previder BV - NL}
NS	`nsauth1.introweb.nl` ⭐
		A	2001:1690:1:a::a^{🇳🇱 PREVIDER-AS2001:1690::/32 NL-PREVIDER-IPV6}
			PTR	`nsauth1.introweb.nl`
		A	80.65.96.48^{🇳🇱 PREVIDER-AS80.65.96.0/19 Previder BV - NL}
			PTR	`nsauth1.introweb.nl`
NS	`nsauth2.introweb.nl`
		A	2a0d:8600:1::5a^{🇳🇱 DCSPINE2a0d:8600::/29}
			PTR	`nsauth2.introweb.nl`
		A	86.105.160.91^{🇺🇸 DCSPINE86.105.160.0/22}
			PTR	`nsauth2.introweb.nl`
NS	`nsauth3.introweb.net`
		A	2001:1690:1:c::a^{🇳🇱 PREVIDER-AS2001:1690::/32 NL-PREVIDER-IPV6}
			PTR	`nsauth3.introweb.net`
		A	62.165.127.221^{🇳🇱 PREVIDER-AS62.165.64.0/18 Previder BV - NL}
			PTR	`nsauth3.introweb.net`
MX	`protector.spam.exchange` ⭐
		A	62.165.74.196^{🇳🇱 PREVIDER-AS62.165.64.0/18 Previder BV - NL}
			PTR	`protector.spam.exchange`
TXT	`MS=ms91578757`
TXT	`v=spf1 -all`
SOA	`nsauth1.introweb.nl`postmaster@introweb.nl 2022-04-26 #1

`nl`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns1.dns.nl` ⭐
	NS	`ns3.dns.nl`
	NS	`ns4.dns.nl`
	TXT	`nl zone update: 2026-04-03 08:00:02 +0000 (EPOCH 1775203202)`
	SOA	`ns1.dns.nl`dns@sidn.nl 2026-04-03 #16

Subdomains

www.calculus-software.nl

Same first word

calculus-software.nl

DNS History

14 records (6 active, 8 former)

○NSdocks13.rzone.de2015-06-11 → 2017-01-29 · 4 obs

● 2015-06-11 13:23:28
● 2017-01-29 21:36:28
○ 2018-11-08 00:57:56
○ 2026-04-03 08:43:46

●NSnsauth1.introweb.nl2018-11-08 → 2026-04-03 · 3 obs

○ 2017-01-29 21:36:28
● 2018-11-08 00:57:56
● 2026-04-03 08:43:46

●NSnsauth2.introweb.nl2018-11-08 → 2026-04-03 · 3 obs

○ 2017-01-29 21:36:28
● 2018-11-08 00:57:56
● 2026-04-03 08:43:46

●NSnsauth3.introweb.net2018-11-08 → 2026-04-03 · 3 obs

○ 2017-01-29 21:36:28
● 2018-11-08 00:57:56
● 2026-04-03 08:43:46

○NSshades10.rzone.de2015-06-11 → 2017-01-29 · 4 obs

● 2015-06-11 13:23:28
● 2017-01-29 21:36:28
○ 2018-11-08 00:57:56
○ 2026-04-03 08:43:46

○MXexchange.topicus.nl2018-11-08 → 2018-11-08 · 4 obs

○ 2017-01-29 21:36:28
● 2018-11-08 00:57:56
○ 2026-02-18 02:09:18
○ 2026-04-03 08:43:46

○MXmail.calculus-software.nl2015-06-11 → 2015-06-11 · 3 obs

● 2015-06-11 13:23:28
○ 2015-11-04 00:25:28
○ 2026-04-03 08:43:46

○MXmail.calculus.nl2015-11-04 → 2017-01-29 · 5 obs

○ 2015-06-11 13:23:28
● 2015-11-04 00:25:28
● 2017-01-29 21:36:28
○ 2018-11-08 00:57:56
○ 2026-04-03 08:43:46

●MXprotector.spam.exchange2018-11-08 → 2026-04-03 · 3 obs

○ 2017-01-29 21:36:28
● 2018-11-08 00:57:56
● 2026-04-03 08:43:46

○MXrelay.rzone.de2015-06-11 → 2017-01-29 · 4 obs

● 2015-06-11 13:23:28
● 2017-01-29 21:36:28
○ 2018-11-08 00:57:56
○ 2026-04-03 08:43:46

●A2001:1690:2:4::1:1142018-11-08 → 2026-04-03 · 3 obs

○ 2017-01-29 21:36:28
● 2018-11-08 00:57:56
● 2026-04-03 08:43:46

○A2a01:238:20a:202:1088::2015-06-11 → 2017-01-29 · 4 obs

● 2015-06-11 13:23:28
● 2017-01-29 21:36:28
○ 2018-11-08 00:57:56
○ 2026-04-03 08:43:46

●A80.65.96.1142018-11-08 → 2026-04-03 · 3 obs

○ 2017-01-29 21:36:28
● 2018-11-08 00:57:56
● 2026-04-03 08:43:46

○A81.169.145.882015-06-11 → 2017-01-29 · 4 obs

● 2015-06-11 13:23:28
● 2017-01-29 21:36:28
○ 2018-11-08 00:57:56
○ 2026-04-03 08:43:46

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
nl	ns3.dns.nl, ns1.dns.nl, ns4.dns.nl	-
calculus-software.nl	nsauth3.introweb.net, nsauth1.introweb.nl, nsauth2.introweb.nl	4 records

✅ Authoritative Response

Server:80.65.96.48

NS records: nsauth3.introweb.net, nsauth1.introweb.nl, nsauth2.introweb.nl

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 572ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`80.65.96.114`
AAAA	1	`2001:1690:2:4::1:114`
NS	3	`nsauth1.introweb.nl, nsauth3.introweb.net...`
MX	1	`protector.spam.exchange (pri: 10)`
TXT	2	`MS=ms91578757, v=spf1 -all`
SOA	1	`nsauth1.introweb.nl postmaster.introweb.`

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (nsauth2.introweb.nl, nsauth1.introweb.nl, nsauth2.introweb.nl...)

Analysis

Hierarchy

calculus-software.nl is the parent of www.calculus-software.nl.

IP Addresses

calculus-software.nl resolves to two IP numbers: 2001:1690:2:4::1:114 and 80.65.96.114.

other host names including afecor.org, busweltomnibusse.com, impactgroep.nl, promocorp.com and previder.it share IP numbers with calculus-software.nl.

Name Servers

calculus-software.nl is delegated to three name servers nsauth3.introweb.net, nsauth1.introweb.nl and nsauth2.introweb.nl.

calculus-software.nl at least partially shares name servers with other domains, for instance ocsfz.com, stepslee.nl, lasbedrijfwilderink.nl, tnieuwland.nl and dupo.de.

Host names with two IP numbers:

nsauth3.introweb.net points to: 2001:1690:1:c::a and 62.165.127.221.

nsauth1.introweb.nl points to: 2001:1690:1:a::a and 80.65.96.48.

nsauth2.introweb.nl points to: 2a0d:8600:1::5a and 86.105.160.91.

Mail Servers

calculus-software.nl is handled by a single mail server, protector.spam.exchange.

calculus-software.nl shares the same mail server setup as other domains, for instance wise-r.nl, topicus-synaps.nl, steunwijzer.nl, protopics.nl and proigia.nl.

calculus-software.nl shares some mail servers with other domains, at least partially, for instance fyndoo.com, finan.nl, topicus.education, eduarte.nl and topicus.nl.

These mail servers are commonly used alongside mail.topicus.nl and exchange.topicus.nl.

protector.spam.exchange resolves to IP 62.165.74.196.

calculus-software.nl - robtex.com