`simcircuits.com`

DNSSEC	⚠️ Not signed
A	3.211.230.19^{🇺🇸 Amazon3.208.0.0/12 EC2 IAD prefix}
		PTR	`ec2-3-211-230-19.compute-1.amazonaws.com`
A	52.204.188.243^{🇺🇸 Amazon52.200.0.0/13 EC2 IAD prefix}
NS	`ns-1297.awsdns-34.org` ⭐
		A	2600:9000:5305:1100::1^{🇺🇸 Amazon2600:9000:5305::/48 - CloudFront}
			PTR	`ns-1297.awsdns-34.org`
		A	205.251.197.17^{🇺🇸 Amazon205.251.197.0/24 prefix}
			PTR	`ns-1297.awsdns-34.org`
NS	`ns-2021.awsdns-60.co.uk`
		A	2600:9000:5307:e500::1^{🇺🇸 Amazon2600:9000:5307::/48 - CloudFront}
			PTR	`ns-2021.awsdns-60.co.uk`
		A	205.251.199.229^{🇺🇸 Amazon205.251.199.0/24 prefix}
			PTR	`ns-2021.awsdns-60.co.uk`
NS	`ns-38.awsdns-04.com`
		A	2600:9000:5300:2600::1^{🇺🇸 Amazon2600:9000:5300::/48 - CloudFront}
			PTR	`ns-38.awsdns-04.com`
		A	205.251.192.38^{🇺🇸 Amazon205.251.192.0/24 prefix}
			PTR	`ns-38.awsdns-04.com`
NS	`ns-731.awsdns-27.net`
		A	2600:9000:5302:db00::1^{🇺🇸 Amazon2600:9000:5302::/48 - CloudFront}
			PTR	`ns-731.awsdns-27.net`
		A	205.251.194.219^{🇺🇸 Amazon205.251.194.0/24 prefix}
			PTR	`ns-731.awsdns-27.net`
TXT	`v=spf1 -all`
SOA	`ns-1297.awsdns-34.org`awsdns-hostmaster@amazon.com serial=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=1783075811

Same first word

simcircuits.com

simcircuits.net

DNS History

51 records (6 active, 45 former)

●NSns-1297.awsdns-34.org2026-02-16 → 2026-07-03 · 3 obs

○ 2020-03-04 16:27:16
● 2026-02-16 13:48:18
● 2026-07-03 11:01:38

●NSns-2021.awsdns-60.co.uk2026-02-16 → 2026-07-03 · 3 obs

○ 2020-03-04 16:27:16
● 2026-02-16 13:48:18
● 2026-07-03 11:01:38

●NSns-38.awsdns-04.com2026-02-16 → 2026-07-03 · 3 obs

○ 2020-03-04 16:27:16
● 2026-02-16 13:48:18
● 2026-07-03 11:01:38

●NSns-731.awsdns-27.net2026-02-16 → 2026-07-03 · 3 obs

○ 2020-03-04 16:27:16
● 2026-02-16 13:48:18
● 2026-07-03 11:01:38

○NSns-master.mathworks.com2015-05-15 → 2020-03-04 · 5 obs

○ 2008-03-08 18:04:26
● 2015-05-15 16:20:06
● 2020-03-04 16:27:16
○ 2026-02-16 13:48:18
○ 2026-07-03 11:01:38

○NSns.mathworks.com2008-03-08 → 2020-03-04 · 4 obs

● 2008-03-08 18:04:26
● 2020-03-04 16:27:16
○ 2026-02-16 13:48:18
○ 2026-07-03 11:01:38

○NSns2.mathworks.com2008-03-08 → 2020-03-04 · 4 obs

● 2008-03-08 18:04:26
● 2020-03-04 16:27:16
○ 2026-02-16 13:48:18
○ 2026-07-03 11:01:38

○NSns3.mathworks.com2008-03-08 → 2020-03-04 · 4 obs

● 2008-03-08 18:04:26
● 2020-03-04 16:27:16
○ 2026-02-16 13:48:18
○ 2026-07-03 11:01:38

○MXmx0.mathworks.com2008-03-08 → 2008-03-08 · 3 obs

● 2008-03-08 18:04:26
○ 2015-05-15 16:20:06
○ 2026-07-03 11:01:38

○MXmxgw-ah.mathworks.com2015-05-15 → 2015-05-15 · 4 obs

○ 2008-03-08 18:04:26
● 2015-05-15 16:20:06
○ 2015-10-12 17:38:46
○ 2026-07-03 11:01:38

○MXmxgw-ls.mathworks.com2015-05-15 → 2015-05-15 · 4 obs

○ 2008-03-08 18:04:26
● 2015-05-15 16:20:06
○ 2015-10-12 17:38:46
○ 2026-07-03 11:01:38

○MXmxgw-uk.mathworks.com2015-05-15 → 2015-05-15 · 4 obs

○ 2008-03-08 18:04:26
● 2015-05-15 16:20:06
○ 2015-10-12 17:38:46
○ 2026-07-03 11:01:38

○MXsmtp.mathworks.co.uk2008-03-08 → 2008-03-08 · 3 obs

● 2008-03-08 18:04:26
○ 2015-05-15 16:20:06
○ 2026-07-03 11:01:38

○MXsmtp.mathworks.com2008-03-08 → 2008-03-08 · 3 obs

● 2008-03-08 18:04:26
○ 2015-05-15 16:20:06
○ 2026-07-03 11:01:38

○A100.50.115.2042026-05-04 → 2026-05-12 · 5 obs

○ 2026-05-02 19:23:48
● 2026-05-04 18:11:34
● 2026-05-12 07:16:12
○ 2026-06-01 03:45:50
○ 2026-07-03 11:01:38

○A107.22.120.1312026-03-14 → 2026-03-17 · 5 obs

○ 2026-03-12 19:28:20
● 2026-03-14 18:18:52
● 2026-03-17 00:15:08
○ 2026-03-22 16:00:02
○ 2026-07-03 11:01:38

○A144.212.130.172015-05-15 → 2020-03-04 · 8 obs

○ 2008-03-08 18:04:26
● 2015-05-15 16:20:06
○ 2015-10-12 17:38:46
○ 2015-12-15 08:38:44
● 2016-03-14 13:33:08
● 2020-03-04 16:27:16
○ 2026-02-16 13:48:18
○ 2026-07-03 11:01:38

○A144.212.244.172015-10-12 → 2020-03-04 · 5 obs

○ 2008-03-08 18:04:26
● 2015-10-12 17:38:46
● 2020-03-04 16:27:16
○ 2026-02-16 13:48:18
○ 2026-07-03 11:01:38

○A18.205.148.1402026-03-02 → 2026-03-12 · 5 obs

○ 2026-02-26 10:56:50
● 2026-03-02 10:35:50
● 2026-03-12 19:28:20
○ 2026-03-14 18:18:52
○ 2026-07-03 11:01:38

○A18.215.141.252026-02-16 → 2026-02-21 · 5 obs

○ 2020-03-04 16:27:16
● 2026-02-16 13:48:18
● 2026-02-21 14:38:52
○ 2026-02-23 08:16:56
○ 2026-07-03 11:01:38

●A3.211.230.192026-07-03 → 2026-07-03 · 2 obs

○ 2026-06-26 23:58:12
● 2026-07-03 11:01:38

○A3.220.156.1242026-06-23 → 2026-06-23 · 4 obs

○ 2026-06-17 17:56:32
● 2026-06-23 09:54:34
○ 2026-06-26 23:58:12
○ 2026-07-03 11:01:38

○A32.194.31.1652026-04-09 → 2026-04-09 · 4 obs

○ 2026-03-28 17:19:38
● 2026-04-09 14:36:04
○ 2026-04-27 16:50:22
○ 2026-07-03 11:01:38

○A34.192.124.1372026-06-26 → 2026-06-26 · 3 obs

○ 2026-06-23 09:54:34
● 2026-06-26 23:58:12
○ 2026-07-03 11:01:38

○A34.202.67.342026-06-01 → 2026-06-01 · 4 obs

○ 2026-05-12 07:16:12
● 2026-06-01 03:45:50
○ 2026-06-01 06:19:28
○ 2026-07-03 11:01:38

○A34.203.164.912026-06-26 → 2026-06-26 · 3 obs

○ 2026-06-23 09:54:34
● 2026-06-26 23:58:12
○ 2026-07-03 11:01:38

○A34.226.187.1232026-02-23 → 2026-02-26 · 5 obs

○ 2026-02-21 14:38:52
● 2026-02-23 08:16:56
● 2026-02-26 10:56:50
○ 2026-03-02 10:35:50
○ 2026-07-03 11:01:38

○A34.230.229.152026-05-02 → 2026-05-02 · 5 obs

○ 2026-04-27 16:50:22
● 2026-05-02 10:56:00
● 2026-05-02 19:23:48
○ 2026-05-04 18:11:34
○ 2026-07-03 11:01:38

○A34.237.103.1262026-03-28 → 2026-03-28 · 4 obs

○ 2026-03-25 02:27:42
● 2026-03-28 17:19:38
○ 2026-04-09 14:36:04
○ 2026-07-03 11:01:38

○A35.171.222.1162026-06-16 → 2026-06-16 · 4 obs

○ 2026-06-10 03:53:34
● 2026-06-16 18:23:06
○ 2026-06-17 17:56:32
○ 2026-07-03 11:01:38

○A35.172.71.1372026-06-16 → 2026-06-16 · 4 obs

○ 2026-06-10 03:53:34
● 2026-06-16 18:23:06
○ 2026-06-17 17:56:32
○ 2026-07-03 11:01:38

○A35.174.187.392026-02-16 → 2026-02-21 · 5 obs

○ 2020-03-04 16:27:16
● 2026-02-16 13:48:18
● 2026-02-21 14:38:52
○ 2026-02-23 08:16:56
○ 2026-07-03 11:01:38

○A44.205.87.452026-04-27 → 2026-04-27 · 4 obs

○ 2026-04-09 14:36:04
● 2026-04-27 16:50:22
○ 2026-05-02 10:56:00
○ 2026-07-03 11:01:38

○A44.208.229.792026-06-23 → 2026-06-23 · 4 obs

○ 2026-06-17 17:56:32
● 2026-06-23 09:54:34
○ 2026-06-26 23:58:12
○ 2026-07-03 11:01:38

○A50.16.29.2342026-06-04 → 2026-06-10 · 5 obs

○ 2026-06-01 06:19:28
● 2026-06-04 11:45:22
● 2026-06-10 03:53:34
○ 2026-06-16 18:23:06
○ 2026-07-03 11:01:38

○A52.20.48.2412026-06-17 → 2026-06-17 · 4 obs

○ 2026-06-16 18:23:06
● 2026-06-17 17:56:32
○ 2026-06-23 09:54:34
○ 2026-07-03 11:01:38

○A52.202.217.972026-03-14 → 2026-03-17 · 5 obs

○ 2026-03-12 19:28:20
● 2026-03-14 18:18:52
● 2026-03-17 00:15:08
○ 2026-03-22 16:00:02
○ 2026-07-03 11:01:38

○A52.204.117.602026-04-09 → 2026-04-09 · 4 obs

○ 2026-03-28 17:19:38
● 2026-04-09 14:36:04
○ 2026-04-27 16:50:22
○ 2026-07-03 11:01:38

○A52.204.17.2322026-06-01 → 2026-06-01 · 4 obs

○ 2026-06-01 03:45:50
● 2026-06-01 06:19:28
○ 2026-06-04 11:45:22
○ 2026-07-03 11:01:38

●A52.204.188.2432026-07-03 → 2026-07-03 · 2 obs

○ 2026-06-26 23:58:12
● 2026-07-03 11:01:38

○A52.205.231.182026-06-01 → 2026-06-01 · 4 obs

○ 2026-05-12 07:16:12
● 2026-06-01 03:45:50
○ 2026-06-01 06:19:28
○ 2026-07-03 11:01:38

○A52.23.75.1792026-06-04 → 2026-06-10 · 5 obs

○ 2026-06-01 06:19:28
● 2026-06-04 11:45:22
● 2026-06-10 03:53:34
○ 2026-06-16 18:23:06
○ 2026-07-03 11:01:38

○A52.4.140.2032026-03-02 → 2026-03-12 · 5 obs

○ 2026-02-26 10:56:50
● 2026-03-02 10:35:50
● 2026-03-12 19:28:20
○ 2026-03-14 18:18:52
○ 2026-07-03 11:01:38

○A52.45.217.2312026-04-27 → 2026-05-04 · 5 obs

○ 2026-04-09 14:36:04
● 2026-04-27 16:50:22
● 2026-05-04 18:11:34
○ 2026-05-08 02:51:06
○ 2026-07-03 11:01:38

○A52.71.104.1282026-03-28 → 2026-03-28 · 4 obs

○ 2026-03-25 02:27:42
● 2026-03-28 17:19:38
○ 2026-04-09 14:36:04
○ 2026-07-03 11:01:38

○A54.157.51.1852026-03-22 → 2026-03-25 · 5 obs

○ 2026-03-17 00:15:08
● 2026-03-22 16:00:02
● 2026-03-25 02:27:42
○ 2026-03-28 17:19:38
○ 2026-07-03 11:01:38

○A54.83.137.2532026-06-17 → 2026-06-17 · 4 obs

○ 2026-06-16 18:23:06
● 2026-06-17 17:56:32
○ 2026-06-23 09:54:34
○ 2026-07-03 11:01:38

○A98.87.100.2032026-03-22 → 2026-03-25 · 5 obs

○ 2026-03-17 00:15:08
● 2026-03-22 16:00:02
● 2026-03-25 02:27:42
○ 2026-03-28 17:19:38
○ 2026-07-03 11:01:38

○A98.87.130.1642026-06-01 → 2026-06-01 · 4 obs

○ 2026-06-01 03:45:50
● 2026-06-01 06:19:28
○ 2026-06-04 11:45:22
○ 2026-07-03 11:01:38

○A98.87.232.1122026-02-23 → 2026-02-26 · 5 obs

○ 2026-02-21 14:38:52
● 2026-02-23 08:16:56
● 2026-02-26 10:56:50
○ 2026-03-02 10:35:50
○ 2026-07-03 11:01:38

○A98.90.13.2172026-05-08 → 2026-05-12 · 5 obs

○ 2026-05-04 18:11:34
● 2026-05-08 02:51:06
● 2026-05-12 07:16:12
○ 2026-06-01 03:45:50
○ 2026-07-03 11:01:38

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	j.gtld-servers.net, a.gtld-servers.net, g.gtld-servers.net, l.gtld-servers.net...	-
simcircuits.com	ns-38.awsdns-04.com, ns-731.awsdns-27.net, ns-1297.awsdns-34.org, ns-2021.awsdns-60.co.uk	2 records

✅ Authoritative Response

Server:205.251.194.219

NS records: ns-38.awsdns-04.com, ns-731.awsdns-27.net, ns-1297.awsdns-34.org, ns-2021.awsdns-60.co.uk

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for simcircuits.com (unsigned zone)

⏱️ Timing

Total: 486ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`52.204.188.243, 3.211.230.19`
NS	4	`ns-1297.awsdns-34.org, ns-2021.awsdns-60.co.uk...`
TXT	1	`v=spf1 -all`
SOA	1	`ns-1297.awsdns-34.org awsdns-hostmaster.`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns-38.awsdns-04.com, ns-38.awsdns-04.com)

Analysis

IP Addresses

simcircuits.com resolves to the IP addresses 3.211.230.19 and 52.204.188.243

Two other host names, along with xpctarget.org, www.mathworks.social and mathpad.de, also share IP numbers with simcircuits.com.

Name Servers

The NS records for simcircuits.com point to four name servers: ns-38.awsdns-04.com, ns-731.awsdns-27.net, ns-1297.awsdns-34.org and ns-2021.awsdns-60.co.uk.

simcircuits.com partially shares its NS delegation with several other domains, including radio-rur.de, reiterhof-beck.de, (0x6d696c66)kontakte.ch and two others.

ns-38.awsdns-04.com, ns-731.awsdns-27.net, ns-1297.awsdns-34.org and ns-2021.awsdns-60.co.uk each carry two IP addresses. ns-38.awsdns-04.com has 205.251.192.38 and 2600:9000:5300:2600::1; ns-731.awsdns-27.net has 205.251.194.219 and 2600:9000:5302:db00::1; ns-1297.awsdns-34.org has 205.251.197.17 and 2600:9000:5305:1100::1; ns-2021.awsdns-60.co.uk has 205.251.199.229 and 2600:9000:5307:e500::1.

simcircuits.com - robtex.com

simcircuits.com

com

Same first word

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

IP Addresses

Name Servers

`simcircuits.com`

`com`