techstudyslack.com - dns.ninja

`techstudyslack.com`

DNSSEC	⚠️ Not signed
A	13.35.107.51^{🇺🇸 Amazon13.35.107.0/24 -Cloudfront}
		PTR	`server-13-35-107-51.phl51.r.cloudfront.net`
A	13.35.107.83^{🇺🇸 Amazon13.35.107.0/24 -Cloudfront}
A	13.35.107.88^{🇺🇸 Amazon13.35.107.0/24 -Cloudfront}
A	13.35.107.117^{🇺🇸 Amazon13.35.107.0/24 -Cloudfront}
NS	`ns-1092.awsdns-08.org` ⭐
		A	2600:9000:5304:4400::1^{🇺🇸 Amazon2600:9000:5304::/48 - CloudFront}
			PTR	`ns-1092.awsdns-08.org`
		A	205.251.196.68^{🇺🇸 Amazon205.251.196.0/24 prefix}
			PTR	`ns-1092.awsdns-08.org`
NS	`ns-1545.awsdns-01.co.uk`
		A	2600:9000:5306:900::1^{🇺🇸 Amazon2600:9000:5306::/48 - CloudFront}
			PTR	`ns-1545.awsdns-01.co.uk`
		A	205.251.198.9^{🇺🇸 Amazon205.251.198.0/24 prefix}
			PTR	`ns-1545.awsdns-01.co.uk`
NS	`ns-488.awsdns-61.com`
		A	2600:9000:5301:e800::1^{🇺🇸 Amazon2600:9000:5301::/48 - CloudFront}
			PTR	`ns-488.awsdns-61.com`
		A	205.251.193.232^{🇺🇸 Amazon205.251.193.0/24 prefix}
			PTR	`ns-488.awsdns-61.com`
NS	`ns-520.awsdns-01.net`
		A	2600:9000:5302:800::1^{🇺🇸 Amazon2600:9000:5302::/48 - CloudFront}
			PTR	`ns-520.awsdns-01.net`
		A	205.251.194.8^{🇺🇸 Amazon205.251.194.0/24 prefix}
			PTR	`ns-520.awsdns-01.net`
MX	`mail.protonmail.ch` ⭐
		A	176.119.200.128^{🇨🇭 Proton176.119.200.0/24}
			PTR	`mail.protonmail.ch`
		A	185.70.42.128^{🇨🇭 Proton185.70.42.0/24}
			PTR	`mail.protonmail.ch`
		A	185.205.70.128^{🇫🇷 Proton185.205.70.0/24}
			PTR	`mail.protonmail.ch`
MX	`mailsec.protonmail.ch`⁽²⁰⁾
		A	176.119.200.129^{🇨🇭 Proton176.119.200.0/24}
			PTR	`mailsec.protonmail.ch`
		A	185.70.42.129^{🇨🇭 Proton185.70.42.0/24}
			PTR	`mailsec.protonmail.ch`
		A	185.205.70.129^{🇫🇷 Proton185.205.70.0/24}
			PTR	`mailsec.protonmail.ch`
TXT	`protonmail-verification=2abb4cf7ced5529cf3c11c3e9ec8614834c2fca8`
TXT	`v=spf1 include:_spf.protonmail.ch mx ~all`
SOA	`ns-1092.awsdns-08.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=1785202087

Same first word

techstudyslack.com

DNS History

106 records (10 active, 96 former)

●NSns-1092.awsdns-08.org2019-12-15 → 2026-07-28 · 2 obs

● 2019-12-15 01:30:30
● 2026-07-28 01:35:22

●NSns-1545.awsdns-01.co.uk2019-12-15 → 2026-07-28 · 2 obs

● 2019-12-15 01:30:30
● 2026-07-28 01:35:22

●NSns-488.awsdns-61.com2019-12-15 → 2026-07-28 · 2 obs

● 2019-12-15 01:30:30
● 2026-07-28 01:35:22

●NSns-520.awsdns-01.net2019-12-15 → 2026-07-28 · 2 obs

● 2019-12-15 01:30:30
● 2026-07-28 01:35:22

●MXmail.protonmail.ch2026-02-15 → 2026-07-28 · 2 obs

● 2026-02-15 06:57:04
● 2026-07-28 01:35:22

●MXmailsec.protonmail.ch2026-02-15 → 2026-07-28 · 2 obs

● 2026-02-15 06:57:04
● 2026-07-28 01:35:22

○A108.139.119.112026-04-15 → 2026-06-08 · 19 obs

○ 2026-04-15 06:03:16
● 2026-04-15 07:06:58
○ 2026-04-15 17:08:20
● 2026-04-15 21:14:56
○ 2026-04-16 06:04:06
○ 2026-04-17 08:19:34
● 2026-04-17 15:19:30
● 2026-04-18 00:31:04
○ 2026-04-18 05:55:28
○ 2026-04-18 21:27:04
● 2026-04-19 02:59:48
○ 2026-04-19 04:00:34
○ 2026-05-18 21:01:50
● 2026-05-18 22:06:48
○ 2026-05-19 06:06:46
○ 2026-06-07 20:20:40
● 2026-06-08 01:15:16
○ 2026-06-08 13:39:16
○ 2026-07-28 01:35:22

○A108.139.119.382026-04-15 → 2026-06-08 · 19 obs

○A108.139.119.662026-04-15 → 2026-06-08 · 19 obs

○A108.139.119.862026-04-15 → 2026-06-08 · 19 obs

○A108.156.22.1132026-03-25 → 2026-07-17 · 20 obs

○ 2026-03-24 16:42:52
● 2026-03-25 02:02:32
○ 2026-03-25 10:37:22
● 2026-07-11 19:12:30
○ 2026-07-11 19:44:16
● 2026-07-12 17:19:46
○ 2026-07-12 18:13:48
● 2026-07-13 16:10:14
○ 2026-07-13 18:30:32
● 2026-07-14 08:32:52
○ 2026-07-14 09:30:38
● 2026-07-15 00:53:56
○ 2026-07-15 01:29:06
● 2026-07-15 02:09:18
○ 2026-07-15 03:29:10
● 2026-07-16 18:04:48
○ 2026-07-16 20:27:42
● 2026-07-17 07:15:56
○ 2026-07-17 08:24:50
○ 2026-07-28 01:35:22

○A108.156.22.422026-03-25 → 2026-07-17 · 20 obs

○A108.156.22.842026-03-25 → 2026-07-17 · 20 obs

○A108.156.22.982026-03-25 → 2026-07-17 · 20 obs

○A108.156.91.1112026-05-19 → 2026-07-02 · 26 obs

○ 2026-05-19 06:06:46
● 2026-05-19 10:28:50
○ 2026-05-20 05:26:52
● 2026-05-20 06:52:14
○ 2026-05-21 14:11:44
○ 2026-05-22 16:59:30
● 2026-05-23 03:35:58
● 2026-05-27 16:43:34
○ 2026-05-29 20:09:52
○ 2026-06-01 08:26:40
● 2026-06-02 00:30:22
● 2026-06-03 05:15:52
○ 2026-06-04 12:09:14
● 2026-06-04 14:37:16
● 2026-06-06 16:26:26
○ 2026-06-06 20:49:14
● 2026-06-06 22:09:20
● 2026-06-07 20:20:40
○ 2026-06-08 01:15:16
● 2026-06-30 06:55:50
○ 2026-06-30 09:31:08
● 2026-06-30 10:13:38
○ 2026-06-30 16:25:00
● 2026-07-02 01:47:30
○ 2026-07-02 07:01:34
○ 2026-07-28 01:35:22

○A108.156.91.202026-05-19 → 2026-07-02 · 26 obs

○A108.156.91.272026-05-19 → 2026-07-02 · 26 obs

○A108.156.91.572026-05-19 → 2026-07-02 · 26 obs

○A108.158.186.1222026-04-10 → 2026-04-11 · 8 obs

○ 2026-04-06 17:01:46
● 2026-04-10 19:42:56
○ 2026-04-10 20:36:04
● 2026-04-11 00:09:22
○ 2026-04-11 00:47:20
● 2026-04-11 15:10:46
○ 2026-04-11 15:43:32
○ 2026-07-28 01:35:22

○A108.158.186.152026-04-10 → 2026-04-11 · 8 obs

○ 2026-04-06 17:01:46
● 2026-04-10 19:42:56
○ 2026-04-10 20:36:04
● 2026-04-11 00:09:22
○ 2026-04-11 00:47:20
● 2026-04-11 15:10:46
○ 2026-04-11 15:43:32
○ 2026-07-28 01:35:22

○A108.158.186.332026-04-10 → 2026-04-11 · 8 obs

○ 2026-04-06 17:01:46
● 2026-04-10 19:42:56
○ 2026-04-10 20:36:04
● 2026-04-11 00:09:22
○ 2026-04-11 00:47:20
● 2026-04-11 15:10:46
○ 2026-04-11 15:43:32
○ 2026-07-28 01:35:22

○A108.158.186.832026-04-10 → 2026-04-11 · 8 obs

○ 2026-04-06 17:01:46
● 2026-04-10 19:42:56
○ 2026-04-10 20:36:04
● 2026-04-11 00:09:22
○ 2026-04-11 00:47:20
● 2026-04-11 15:10:46
○ 2026-04-11 15:43:32
○ 2026-07-28 01:35:22

○A13.226.238.1202026-02-25 → 2026-02-26 · 8 obs

○ 2026-02-22 16:40:32
● 2026-02-25 01:19:16
○ 2026-02-25 03:37:22
○ 2026-02-26 01:26:44
● 2026-02-26 13:00:48
● 2026-02-26 18:59:58
○ 2026-02-27 01:53:48
○ 2026-07-28 01:35:22

○A13.226.238.642026-02-25 → 2026-02-26 · 8 obs

○ 2026-02-22 16:40:32
● 2026-02-25 01:19:16
○ 2026-02-25 03:37:22
○ 2026-02-26 01:26:44
● 2026-02-26 13:00:48
● 2026-02-26 18:59:58
○ 2026-02-27 01:53:48
○ 2026-07-28 01:35:22

○A13.226.238.92026-02-25 → 2026-02-26 · 8 obs

○ 2026-02-22 16:40:32
● 2026-02-25 01:19:16
○ 2026-02-25 03:37:22
○ 2026-02-26 01:26:44
● 2026-02-26 13:00:48
● 2026-02-26 18:59:58
○ 2026-02-27 01:53:48
○ 2026-07-28 01:35:22

○A13.226.238.912026-02-25 → 2026-02-26 · 8 obs

○ 2026-02-22 16:40:32
● 2026-02-25 01:19:16
○ 2026-02-25 03:37:22
○ 2026-02-26 01:26:44
● 2026-02-26 13:00:48
● 2026-02-26 18:59:58
○ 2026-02-27 01:53:48
○ 2026-07-28 01:35:22

○A13.227.171.1042019-12-15 → 2019-12-15 · 3 obs

● 2019-12-15 01:30:30
○ 2026-02-15 06:57:04
○ 2026-07-28 01:35:22

○A13.227.171.1112019-12-15 → 2019-12-15 · 3 obs

● 2019-12-15 01:30:30
○ 2026-02-15 06:57:04
○ 2026-07-28 01:35:22

○A13.227.171.572019-12-15 → 2019-12-15 · 3 obs

● 2019-12-15 01:30:30
○ 2026-02-15 06:57:04
○ 2026-07-28 01:35:22

○A13.227.171.842019-12-15 → 2019-12-15 · 3 obs

● 2019-12-15 01:30:30
○ 2026-02-15 06:57:04
○ 2026-07-28 01:35:22

○A13.249.182.412026-03-20 → 2026-03-20 · 4 obs

○ 2026-03-14 17:22:04
● 2026-03-20 11:19:42
○ 2026-03-20 13:55:50
○ 2026-07-28 01:35:22

○A13.249.182.462026-03-20 → 2026-03-20 · 4 obs

○ 2026-03-14 17:22:04
● 2026-03-20 11:19:42
○ 2026-03-20 13:55:50
○ 2026-07-28 01:35:22

○A13.249.182.522026-03-20 → 2026-03-20 · 4 obs

○ 2026-03-14 17:22:04
● 2026-03-20 11:19:42
○ 2026-03-20 13:55:50
○ 2026-07-28 01:35:22

○A13.249.182.732026-03-20 → 2026-03-20 · 4 obs

○ 2026-03-14 17:22:04
● 2026-03-20 11:19:42
○ 2026-03-20 13:55:50
○ 2026-07-28 01:35:22

○A13.33.129.1062026-05-06 → 2026-05-19 · 18 obs

○ 2026-05-04 03:28:46
● 2026-05-06 04:01:20
○ 2026-05-06 06:50:30
○ 2026-05-06 19:37:22
● 2026-05-06 20:25:10
● 2026-05-07 06:13:24
○ 2026-05-07 10:10:40
○ 2026-05-10 10:11:52
● 2026-05-10 17:00:26
○ 2026-05-10 19:20:06
○ 2026-05-12 21:51:22
● 2026-05-13 13:39:48
● 2026-05-14 02:26:42
○ 2026-05-14 10:03:30
○ 2026-05-18 22:06:48
● 2026-05-19 06:06:46
○ 2026-05-19 10:28:50
○ 2026-07-28 01:35:22

○A13.33.129.1142026-05-06 → 2026-05-19 · 18 obs

○A13.33.129.1252026-05-06 → 2026-05-19 · 18 obs

○A13.33.129.322026-05-06 → 2026-05-19 · 18 obs

○A13.33.131.1012026-07-13 → 2026-07-26 · 12 obs

○ 2026-07-13 16:10:14
● 2026-07-13 18:30:32
○ 2026-07-14 08:32:52
● 2026-07-14 09:30:38
○ 2026-07-14 17:49:36
● 2026-07-23 10:33:34
○ 2026-07-23 15:53:40
● 2026-07-24 15:24:36
○ 2026-07-26 17:16:50
● 2026-07-26 20:55:22
○ 2026-07-27 03:00:24
○ 2026-07-28 01:35:22

○A13.33.131.1152026-07-13 → 2026-07-26 · 12 obs

○A13.33.131.152026-07-13 → 2026-07-26 · 12 obs

○A13.33.131.182026-07-13 → 2026-07-26 · 12 obs

○A13.33.82.1002026-04-21 → 2026-05-09 · 19 obs

○ 2026-04-19 04:00:34
● 2026-04-21 02:15:58
○ 2026-04-21 11:14:52
● 2026-04-21 15:11:14
○ 2026-04-21 20:38:00
○ 2026-04-25 14:14:16
● 2026-04-25 19:14:26
● 2026-04-27 00:29:24
○ 2026-04-27 03:23:32
○ 2026-05-03 02:10:10
● 2026-05-03 10:03:00
● 2026-05-03 20:19:46
○ 2026-05-04 03:28:46
○ 2026-05-08 18:49:54
● 2026-05-09 00:35:34
○ 2026-05-09 01:20:30
● 2026-05-09 13:10:28
○ 2026-05-09 14:12:48
○ 2026-07-28 01:35:22

○A13.33.82.302026-04-21 → 2026-05-09 · 19 obs

○A13.33.82.52026-04-21 → 2026-05-09 · 19 obs

○A13.33.82.962026-04-21 → 2026-05-09 · 19 obs

●A13.35.107.1172026-07-12 → 2026-07-28 · 15 obs

○ 2026-07-12 17:19:46
● 2026-07-12 18:13:48
○ 2026-07-13 16:10:14
● 2026-07-14 17:49:36
○ 2026-07-15 00:53:56
● 2026-07-18 07:24:58
○ 2026-07-18 20:28:42
● 2026-07-19 07:40:50
○ 2026-07-20 05:40:36
● 2026-07-21 21:47:52
○ 2026-07-22 06:24:34
● 2026-07-26 17:16:50
○ 2026-07-26 20:55:22
● 2026-07-27 15:32:00
● 2026-07-28 01:35:22

●A13.35.107.512026-07-12 → 2026-07-28 · 15 obs

●A13.35.107.832026-07-12 → 2026-07-28 · 15 obs

●A13.35.107.882026-07-12 → 2026-07-28 · 15 obs

○A13.35.78.102026-02-17 → 2026-07-11 · 48 obs

○ 2026-02-17 06:33:50
● 2026-02-17 10:40:12
○ 2026-02-17 13:28:52
● 2026-02-17 14:51:04
○ 2026-02-17 21:23:20
● 2026-02-18 12:46:22
○ 2026-02-18 23:17:34
○ 2026-02-21 02:59:42
● 2026-02-21 13:59:22
● 2026-02-22 15:55:38
○ 2026-02-22 16:40:32
○ 2026-03-20 13:55:50
● 2026-03-21 10:45:52
○ 2026-03-21 21:13:44
○ 2026-06-18 16:24:00
● 2026-06-21 03:55:08
○ 2026-06-21 05:16:44
● 2026-06-21 06:47:14
○ 2026-06-21 09:00:22
● 2026-06-23 19:14:42
○ 2026-06-23 23:37:50
● 2026-06-24 12:15:20
○ 2026-06-24 13:39:42
● 2026-06-24 23:23:38
○ 2026-06-25 03:35:16
● 2026-06-26 04:40:44
○ 2026-06-26 06:43:06
● 2026-06-26 13:30:34
○ 2026-06-26 15:20:04
● 2026-06-27 04:21:12
○ 2026-06-27 06:30:26
● 2026-06-27 16:43:36
○ 2026-06-27 17:57:28
● 2026-06-28 09:09:38
○ 2026-06-28 10:04:08
● 2026-06-29 02:50:44
○ 2026-06-29 06:33:26
● 2026-06-30 09:31:08
○ 2026-06-30 10:13:38
● 2026-07-03 01:09:30
○ 2026-07-03 05:57:30
● 2026-07-03 19:14:38
○ 2026-07-03 22:01:52
● 2026-07-11 02:45:44
○ 2026-07-11 04:04:56
● 2026-07-11 14:40:52
○ 2026-07-11 16:21:58
○ 2026-07-28 01:35:22

○A13.35.78.1012026-02-17 → 2026-07-11 · 48 obs

○A13.35.78.1272026-02-17 → 2026-07-11 · 48 obs

○A13.35.78.902026-02-17 → 2026-07-11 · 48 obs

○A18.155.21.202026-06-14 → 2026-07-23 · 54 obs

○ 2026-06-11 08:39:30
● 2026-06-14 12:28:34
○ 2026-06-14 17:23:02
○ 2026-06-15 16:23:56
● 2026-06-15 17:23:02
○ 2026-06-15 23:47:52
○ 2026-06-16 01:10:42
● 2026-06-16 06:43:52
○ 2026-06-16 08:25:42
● 2026-06-16 10:47:48
○ 2026-06-16 13:58:02
● 2026-07-01 11:46:14
○ 2026-07-02 01:47:30
● 2026-07-02 07:01:34
○ 2026-07-03 01:09:30
● 2026-07-03 15:58:22
○ 2026-07-03 18:37:02
● 2026-07-04 14:57:50
○ 2026-07-08 04:34:02
● 2026-07-08 05:15:28
○ 2026-07-08 20:19:06
● 2026-07-09 06:47:24
○ 2026-07-09 13:41:04
● 2026-07-09 17:52:58
○ 2026-07-10 06:40:54
● 2026-07-10 08:33:42
○ 2026-07-11 02:45:44
● 2026-07-11 16:21:58
○ 2026-07-11 19:12:30
● 2026-07-11 19:44:16
○ 2026-07-12 17:19:46
● 2026-07-15 01:29:06
○ 2026-07-15 02:09:18
● 2026-07-15 03:29:10
○ 2026-07-16 18:04:48
● 2026-07-16 20:27:42
○ 2026-07-17 07:15:56
● 2026-07-17 08:24:50
○ 2026-07-18 07:24:58
● 2026-07-18 20:28:42
○ 2026-07-19 07:40:50
● 2026-07-20 05:40:36
○ 2026-07-20 14:10:12
● 2026-07-20 15:46:18
○ 2026-07-21 15:39:08
● 2026-07-21 17:42:26
○ 2026-07-21 21:47:52
● 2026-07-22 06:24:34
○ 2026-07-22 18:24:38
● 2026-07-22 22:45:00
○ 2026-07-23 10:33:34
● 2026-07-23 15:53:40
○ 2026-07-24 15:24:36
○ 2026-07-28 01:35:22

○A18.155.21.592026-06-14 → 2026-07-23 · 54 obs

○A18.155.21.612026-06-14 → 2026-07-23 · 54 obs

○A18.155.21.682026-06-14 → 2026-07-23 · 54 obs

○A18.164.68.462026-02-17 → 2026-06-30 · 46 obs

○ 2026-02-17 14:51:04
● 2026-02-17 21:23:20
● 2026-02-18 07:51:52
○ 2026-02-18 12:46:22
● 2026-02-18 23:17:34
○ 2026-02-20 20:21:56
○ 2026-02-26 18:59:58
● 2026-02-27 01:53:48
● 2026-05-18 21:01:50
○ 2026-05-18 22:06:48
○ 2026-06-08 01:15:16
● 2026-06-08 13:39:16
● 2026-06-14 17:23:02
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○A52.222.244.292026-02-15 → 2026-07-22 · 40 obs

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○A99.86.91.772026-03-07 → 2026-03-07 · 4 obs

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🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
techstudyslack.com	ns-520.awsdns-01.net, ns-488.awsdns-61.com, ns-1545.awsdns-01.co.uk, ns-1092.awsdns-08.org	2 records

✅ Authoritative Response

Server:205.251.194.8

NS records: ns-520.awsdns-01.net, ns-488.awsdns-61.com, ns-1545.awsdns-01.co.uk, ns-1092.awsdns-08.org

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for techstudyslack.com (unsigned zone)

⏱️ Timing

Total: 496ms | Queries: -

📄 Records

Type	Count	Sample Data
A	4	`13.35.107.117, 13.35.107.88...`
NS	4	`ns-1092.awsdns-08.org, ns-1545.awsdns-01.co.uk...`
MX	2	`mail.protonmail.ch (pri: 10), mailsec.protonmail.ch (pri: 20)`
TXT	2	`protonmail-verification=2abb4cf7ced5529c, v=spf1 include:_spf.protonmail.ch mx ~al`
SOA	1	`ns-1092.awsdns-08.org awsdns-hostmaster.`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns-488.awsdns-61.com, ns-488.awsdns-61.com)

Analysis

IP Addresses

techstudyslack.com resolves to four IP addresses: 13.35.107.51, 13.35.107.83, 13.35.107.88 and 13.35.107.117.

18tyd.trackvoluum.com, reachnow-alternate.test-app.link, d3wp9dkntnady.cloudfront.net and two other host names share IP numbers with techstudyslack.com.

Name Servers

The authoritative name servers for techstudyslack.com are ns-488.awsdns-61.com, ns-520.awsdns-01.net, ns-1092.awsdns-08.org and ns-1545.awsdns-01.co.uk.

techstudyslack.com partially shares its NS delegation with several other domains, including thelincolnlawyernetflix.com, robertdisney.com, entry.athleticsireland.ie and two others.

ns-488.awsdns-61.com, ns-520.awsdns-01.net, ns-1092.awsdns-08.org and ns-1545.awsdns-01.co.uk each carry two IP addresses. ns-488.awsdns-61.com has 205.251.193.232 and 2600:9000:5301:e800::1; ns-520.awsdns-01.net has 205.251.194.8 and 2600:9000:5302:800::1; ns-1092.awsdns-08.org has 205.251.196.68 and 2600:9000:5304:4400::1; ns-1545.awsdns-01.co.uk has 205.251.198.9 and 2600:9000:5306:900::1.

Mail Servers

Mail for techstudyslack.com is handled by two mail servers — mail.protonmail.ch and mailsec.protonmail.ch.

techstudyslack.com uses an identical mail server configuration to several other domains — among them oops.email, lukeharrisonford.com, prateekjain.me and two more.

techstudyslack.com has at least partial mail server overlap with other domains such as lifelearnu.com, vin-dit.org, treibick.com and two more.

mail.protonmail.ch has three IP addresses (176.119.200.128, 185.70.42.128 and 185.205.70.128) and mailsec.protonmail.ch has three IP addresses (176.119.200.129, 185.70.42.129 and 185.205.70.129).