emacourse.com - dns.ninja

`emacourse.com`

DNSSEC	⚠️ Not signed
A	18.160.46.15^{🇺🇸 Amazon18.160.46.0/23}
		PTR	`server-18-160-46-15.iad55.r.cloudfront.net`
A	18.160.46.28^{🇺🇸 Amazon18.160.46.0/23}
A	18.160.46.47^{🇺🇸 Amazon18.160.46.0/23}
A	18.160.46.116^{🇺🇸 Amazon18.160.46.0/23}
NS	`ns-287.awsdns-35.com` ⭐
		A	2600:9000:5301:1f00::1^{🇺🇸 Amazon2600:9000:5301::/48 - CloudFront}
			PTR	`ns-287.awsdns-35.com`
		A	205.251.193.31^{🇺🇸 Amazon205.251.193.0/24 prefix}
			PTR	`ns-287.awsdns-35.com`
NS	`ns-1117.awsdns-11.org`
		A	2600:9000:5304:5d00::1^{🇺🇸 Amazon2600:9000:5304::/48 - CloudFront}
			PTR	`ns-1117.awsdns-11.org`
		A	205.251.196.93^{🇺🇸 Amazon205.251.196.0/24 prefix}
			PTR	`ns-1117.awsdns-11.org`
NS	`ns-1748.awsdns-26.co.uk`
		A	2600:9000:5306:d400::1^{🇺🇸 Amazon2600:9000:5306::/48 - CloudFront}
			PTR	`ns-1748.awsdns-26.co.uk`
		A	205.251.198.212^{🇺🇸 Amazon205.251.198.0/24 prefix}
			PTR	`ns-1748.awsdns-26.co.uk`
NS	`ns-899.awsdns-48.net`
		A	2600:9000:5303:8300::1^{🇺🇸 Amazon2600:9000:5303::/48 - CloudFront}
			PTR	`ns-899.awsdns-48.net`
		A	205.251.195.131^{🇺🇸 Amazon205.251.195.0/24 prefix}
			PTR	`ns-899.awsdns-48.net`
SOA	`ns-287.awsdns-35.com`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=1786343904

Same first word

emacourse.com

Similar names

DNS History

69 records (8 active, 61 former)

●NSns-1117.awsdns-11.org2026-03-09 → 2026-08-10 · 3 obs

○ 2018-07-06 10:40:16
● 2026-03-09 02:03:28
● 2026-08-10 06:59:42

●NSns-1748.awsdns-26.co.uk2026-03-09 → 2026-08-10 · 3 obs

○ 2018-07-06 10:40:16
● 2026-03-09 02:03:28
● 2026-08-10 06:59:42

●NSns-287.awsdns-35.com2026-03-09 → 2026-08-10 · 3 obs

○ 2018-07-06 10:40:16
● 2026-03-09 02:03:28
● 2026-08-10 06:59:42

●NSns-899.awsdns-48.net2026-03-09 → 2026-08-10 · 3 obs

○ 2018-07-06 10:40:16
● 2026-03-09 02:03:28
● 2026-08-10 06:59:42

○NSns37.worldnic.com2015-06-27 → 2018-07-06 · 4 obs

● 2015-06-27 10:52:44
● 2018-07-06 10:40:16
○ 2026-03-09 02:03:28
○ 2026-08-10 06:59:42

○NSns38.worldnic.com2015-06-27 → 2018-07-06 · 4 obs

● 2015-06-27 10:52:44
● 2018-07-06 10:40:16
○ 2026-03-09 02:03:28
○ 2026-08-10 06:59:42

○MXp.webcom.ctmail.com2016-01-21 → 2018-07-06 · 4 obs

● 2016-01-21 03:39:50
● 2018-07-06 10:40:16
○ 2026-03-09 02:03:28
○ 2026-08-10 06:59:42

○A108.139.15.1112026-05-06 → 2026-07-29 · 24 obs

○ 2026-05-04 19:18:30
● 2026-05-06 22:37:38
○ 2026-05-06 23:35:14
○ 2026-05-07 19:34:58
● 2026-05-08 08:23:16
○ 2026-05-08 09:37:08
○ 2026-06-06 23:33:04
● 2026-06-19 18:37:08
○ 2026-06-20 03:38:32
● 2026-06-24 08:32:04
○ 2026-06-24 10:36:44
● 2026-06-26 14:09:30
○ 2026-06-26 15:13:06
● 2026-07-01 23:16:18
○ 2026-07-02 06:24:46
● 2026-07-26 21:22:30
○ 2026-07-26 23:49:34
● 2026-07-28 07:22:38
○ 2026-07-28 22:02:22
● 2026-07-29 10:14:40
○ 2026-07-29 12:01:08
● 2026-07-29 15:50:28
○ 2026-07-30 01:40:52
○ 2026-08-10 06:59:42

○A108.139.15.282026-05-06 → 2026-07-29 · 24 obs

○A108.139.15.52026-05-06 → 2026-07-29 · 24 obs

○A108.139.15.652026-05-06 → 2026-07-29 · 24 obs

○A13.225.143.1192026-06-28 → 2026-06-29 · 6 obs

○ 2026-06-27 10:19:56
● 2026-06-28 19:53:04
○ 2026-06-28 20:23:34
● 2026-06-29 07:34:20
○ 2026-06-29 11:12:22
○ 2026-08-10 06:59:42

○A13.225.143.152026-06-28 → 2026-06-29 · 6 obs

○ 2026-06-27 10:19:56
● 2026-06-28 19:53:04
○ 2026-06-28 20:23:34
● 2026-06-29 07:34:20
○ 2026-06-29 11:12:22
○ 2026-08-10 06:59:42

○A13.225.143.562026-06-28 → 2026-06-29 · 6 obs

○ 2026-06-27 10:19:56
● 2026-06-28 19:53:04
○ 2026-06-28 20:23:34
● 2026-06-29 07:34:20
○ 2026-06-29 11:12:22
○ 2026-08-10 06:59:42

○A13.225.143.912026-06-28 → 2026-06-29 · 6 obs

○ 2026-06-27 10:19:56
● 2026-06-28 19:53:04
○ 2026-06-28 20:23:34
● 2026-06-29 07:34:20
○ 2026-06-29 11:12:22
○ 2026-08-10 06:59:42

○A13.249.141.1282026-05-19 → 2026-07-02 · 22 obs

○ 2026-05-19 01:59:08
● 2026-05-19 08:35:46
● 2026-05-19 09:58:20
○ 2026-05-19 10:29:24
● 2026-05-19 11:02:24
● 2026-05-31 07:46:50
○ 2026-05-31 12:05:18
○ 2026-06-01 06:12:42
● 2026-06-01 18:58:40
○ 2026-06-02 07:48:44
○ 2026-06-03 22:15:40
● 2026-06-04 10:06:20
● 2026-06-05 17:17:30
○ 2026-06-06 07:25:14
● 2026-06-06 23:33:04
● 2026-06-07 17:50:34
○ 2026-06-08 06:50:32
● 2026-06-30 22:29:16
○ 2026-07-01 01:46:58
● 2026-07-02 06:24:46
○ 2026-07-02 22:18:08
○ 2026-08-10 06:59:42

○A13.249.141.222026-05-19 → 2026-07-02 · 22 obs

○A13.249.141.452026-05-19 → 2026-07-02 · 22 obs

○A13.249.141.862026-05-19 → 2026-07-02 · 22 obs

○A13.249.228.1142026-07-28 → 2026-07-28 · 4 obs

○ 2026-07-28 09:09:30
● 2026-07-28 12:03:58
○ 2026-07-28 15:00:44
○ 2026-08-10 06:59:42

○A13.249.228.132026-07-28 → 2026-07-28 · 4 obs

○ 2026-07-28 09:09:30
● 2026-07-28 12:03:58
○ 2026-07-28 15:00:44
○ 2026-08-10 06:59:42

○A13.249.228.172026-07-28 → 2026-07-28 · 4 obs

○ 2026-07-28 09:09:30
● 2026-07-28 12:03:58
○ 2026-07-28 15:00:44
○ 2026-08-10 06:59:42

○A13.249.228.392026-07-28 → 2026-07-28 · 4 obs

○ 2026-07-28 09:09:30
● 2026-07-28 12:03:58
○ 2026-07-28 15:00:44
○ 2026-08-10 06:59:42

○A13.32.230.1092026-06-26 → 2026-08-04 · 28 obs

○ 2026-06-24 21:13:22
● 2026-06-26 12:53:32
○ 2026-06-26 14:09:30
● 2026-07-03 03:33:14
○ 2026-07-03 04:40:44
● 2026-07-04 16:40:44
○ 2026-07-04 21:05:16
● 2026-07-07 18:18:58
○ 2026-07-07 21:28:08
● 2026-07-23 10:09:00
○ 2026-07-23 11:15:02
● 2026-07-28 09:09:30
○ 2026-07-28 12:03:58
● 2026-07-30 04:11:44
○ 2026-07-30 05:15:36
● 2026-07-30 10:20:36
○ 2026-07-30 14:47:46
● 2026-07-31 09:13:36
○ 2026-07-31 12:41:02
● 2026-08-02 22:05:16
○ 2026-08-02 22:46:56
● 2026-08-03 07:13:50
○ 2026-08-03 08:30:22
● 2026-08-04 08:14:46
○ 2026-08-04 08:49:50
● 2026-08-04 13:32:16
○ 2026-08-04 15:10:26
○ 2026-08-10 06:59:42

○A13.32.230.1292026-06-26 → 2026-08-04 · 28 obs

○A13.32.230.472026-06-26 → 2026-08-04 · 28 obs

○A13.32.230.652026-06-26 → 2026-08-04 · 28 obs

○A13.33.82.172026-04-30 → 2026-08-02 · 12 obs

○ 2026-04-08 14:49:22
● 2026-04-30 02:07:50
○ 2026-04-30 03:06:50
○ 2026-05-02 16:13:58
● 2026-05-03 00:28:58
○ 2026-05-03 11:08:16
● 2026-05-04 02:52:00
● 2026-05-04 13:53:56
○ 2026-05-04 19:18:30
● 2026-08-02 17:53:44
○ 2026-08-02 20:08:02
○ 2026-08-10 06:59:42

○A13.33.82.532026-04-30 → 2026-08-02 · 12 obs

○A13.33.82.762026-04-30 → 2026-08-02 · 12 obs

○A13.33.82.932026-04-30 → 2026-08-02 · 12 obs

○A13.35.107.112026-07-14 → 2026-08-02 · 24 obs

○ 2026-07-14 09:05:36
● 2026-07-14 12:27:22
○ 2026-07-14 14:26:18
● 2026-07-14 16:58:48
○ 2026-07-14 23:45:50
● 2026-07-15 18:15:56
○ 2026-07-15 22:51:38
● 2026-07-21 05:00:34
○ 2026-07-21 11:04:54
● 2026-07-26 00:38:08
○ 2026-07-26 15:01:16
● 2026-07-27 02:36:54
○ 2026-07-28 07:22:38
● 2026-07-28 16:11:56
● 2026-07-28 22:02:22
○ 2026-07-29 10:14:40
○ 2026-07-29 15:50:28
● 2026-07-30 01:40:52
○ 2026-07-30 10:20:36
● 2026-07-30 14:47:46
○ 2026-07-31 09:13:36
● 2026-08-02 01:41:12
○ 2026-08-02 13:24:54
○ 2026-08-10 06:59:42

○A13.35.107.572026-07-14 → 2026-08-02 · 24 obs

○A13.35.107.702026-07-14 → 2026-08-02 · 24 obs

○A13.35.107.712026-07-14 → 2026-08-02 · 24 obs

●A18.160.46.1162026-05-22 → 2026-08-10 · 42 obs

○ 2026-05-22 15:02:48
● 2026-05-22 20:26:04
○ 2026-05-22 22:16:56
○ 2026-06-14 06:37:28
● 2026-06-14 20:24:24
○ 2026-06-15 07:34:02
○ 2026-06-19 13:34:14
● 2026-06-20 19:18:56
○ 2026-06-21 03:05:34
○ 2026-06-21 19:22:18
● 2026-06-24 11:39:48
○ 2026-06-24 21:13:22
● 2026-06-26 19:37:12
○ 2026-06-27 10:19:56
● 2026-07-03 04:40:44
○ 2026-07-03 12:30:04
● 2026-07-04 08:58:22
○ 2026-07-04 16:40:44
● 2026-07-07 21:28:08
○ 2026-07-07 22:15:50
● 2026-07-10 10:32:56
○ 2026-07-10 13:13:56
● 2026-08-02 22:46:56
○ 2026-08-03 01:08:16
● 2026-08-03 10:11:10
○ 2026-08-03 11:29:30
● 2026-08-04 15:10:26
○ 2026-08-04 16:07:14
● 2026-08-04 16:46:42
○ 2026-08-04 21:15:12
● 2026-08-05 12:41:04
○ 2026-08-06 15:52:42
● 2026-08-07 19:17:50
○ 2026-08-07 21:23:38
● 2026-08-08 15:55:44
○ 2026-08-08 20:53:04
● 2026-08-08 21:28:24
○ 2026-08-08 23:44:40
● 2026-08-09 17:44:32
○ 2026-08-10 02:19:00
● 2026-08-10 06:16:00
● 2026-08-10 06:59:42

●A18.160.46.152026-05-22 → 2026-08-10 · 42 obs

●A18.160.46.282026-05-22 → 2026-08-10 · 42 obs

●A18.160.46.472026-05-22 → 2026-08-10 · 42 obs

○A18.161.111.1002026-05-27 → 2026-06-05 · 23 obs

○ 2026-05-26 23:13:00
● 2026-05-27 13:13:38
○ 2026-05-27 16:24:44
○ 2026-05-28 07:18:20
● 2026-05-28 09:50:32
○ 2026-05-28 16:58:22
○ 2026-05-29 19:03:50
● 2026-05-29 23:03:48
○ 2026-05-30 03:26:48
○ 2026-05-31 07:46:50
● 2026-05-31 12:05:18
○ 2026-05-31 16:33:06
○ 2026-06-01 22:01:42
● 2026-06-01 23:33:16
○ 2026-06-02 07:48:44
○ 2026-06-02 17:03:36
● 2026-06-03 04:14:28
● 2026-06-03 10:48:04
○ 2026-06-03 19:50:52
○ 2026-06-05 17:17:30
● 2026-06-05 19:28:14
○ 2026-06-05 22:06:56
○ 2026-08-10 06:59:42

○A18.161.111.112026-05-27 → 2026-06-05 · 23 obs

○A18.161.111.762026-05-27 → 2026-06-05 · 23 obs

○A18.161.111.982026-05-27 → 2026-06-05 · 23 obs

○A18.165.122.1172026-07-13 → 2026-08-08 · 14 obs

○ 2026-07-10 13:13:56
● 2026-07-13 16:11:52
○ 2026-07-13 22:13:20
● 2026-07-14 09:05:36
○ 2026-07-14 12:27:22
● 2026-07-14 14:26:18
○ 2026-07-14 16:58:48
● 2026-07-15 22:51:38
○ 2026-07-17 03:34:50
● 2026-08-08 00:05:32
○ 2026-08-08 01:06:56
● 2026-08-08 05:14:50
○ 2026-08-08 07:14:26
○ 2026-08-10 06:59:42

○A18.165.122.282026-07-13 → 2026-08-08 · 14 obs

○A18.165.122.442026-07-13 → 2026-08-08 · 14 obs

○A18.165.122.942026-07-13 → 2026-08-08 · 14 obs

○A18.172.88.32026-05-28 → 2026-05-28 · 4 obs

○ 2026-05-28 16:58:22
● 2026-05-28 22:44:36
○ 2026-05-29 02:34:22
○ 2026-08-10 06:59:42

○A18.172.88.432026-05-28 → 2026-05-28 · 4 obs

○ 2026-05-28 16:58:22
● 2026-05-28 22:44:36
○ 2026-05-29 02:34:22
○ 2026-08-10 06:59:42

○A18.172.88.492026-05-28 → 2026-05-28 · 4 obs

○ 2026-05-28 16:58:22
● 2026-05-28 22:44:36
○ 2026-05-29 02:34:22
○ 2026-08-10 06:59:42

○A18.172.88.962026-05-28 → 2026-05-28 · 4 obs

○ 2026-05-28 16:58:22
● 2026-05-28 22:44:36
○ 2026-05-29 02:34:22
○ 2026-08-10 06:59:42

○A18.239.183.1062026-05-11 → 2026-08-02 · 25 obs

○ 2026-05-08 09:37:08
● 2026-05-11 20:20:28
○ 2026-05-11 21:01:12
○ 2026-05-14 20:25:34
● 2026-05-14 23:34:20
○ 2026-05-15 02:54:44
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● 2026-05-16 23:44:26
○ 2026-05-17 00:27:44
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● 2026-05-18 23:51:32
○ 2026-05-19 01:59:08
○ 2026-05-25 06:26:22
● 2026-05-25 16:20:58
○ 2026-05-25 16:52:48
● 2026-05-25 17:52:04
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● 2026-05-25 21:50:56
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○ 2026-05-26 01:26:08
● 2026-05-26 10:12:54
○ 2026-05-26 17:01:56
● 2026-08-02 13:24:54
○ 2026-08-02 17:53:44
○ 2026-08-10 06:59:42

○A18.239.183.272026-05-11 → 2026-08-02 · 25 obs

○A18.239.183.682026-05-11 → 2026-08-02 · 25 obs

○A18.239.183.972026-05-11 → 2026-08-02 · 25 obs

○A205.178.189.1312015-06-27 → 2018-07-06 · 4 obs

● 2015-06-27 10:52:44
● 2018-07-06 10:40:16
○ 2026-03-09 02:03:28
○ 2026-08-10 06:59:42

○A24.222.7.822026-03-09 → 2026-04-08 · 5 obs

○ 2018-07-06 10:40:16
● 2026-03-09 02:03:28
● 2026-04-08 14:49:22
○ 2026-04-30 02:07:50
○ 2026-08-10 06:59:42

○A3.171.117.162026-05-19 → 2026-05-26 · 10 obs

○ 2026-05-19 09:58:20
● 2026-05-19 10:29:24
○ 2026-05-19 11:02:24
○ 2026-05-22 02:43:20
● 2026-05-22 09:39:44
○ 2026-05-22 15:02:48
○ 2026-05-26 17:01:56
● 2026-05-26 18:50:44
○ 2026-05-26 23:13:00
○ 2026-08-10 06:59:42

○A3.171.117.262026-05-19 → 2026-05-26 · 10 obs

○A3.171.117.812026-05-19 → 2026-05-26 · 10 obs

○A3.171.117.882026-05-19 → 2026-05-26 · 10 obs

○A3.174.141.122026-04-30 → 2026-06-29 · 24 obs

○ 2026-04-30 02:07:50
● 2026-04-30 03:06:50
○ 2026-04-30 11:15:18
○ 2026-04-30 18:40:46
● 2026-05-01 02:14:52
○ 2026-05-02 08:26:58
○ 2026-05-04 02:52:00
● 2026-05-04 19:18:30
○ 2026-05-06 22:37:38
● 2026-05-06 23:35:14
● 2026-05-18 18:04:56
○ 2026-05-18 23:51:32
○ 2026-06-10 18:49:58
● 2026-06-11 22:22:26
● 2026-06-21 19:22:18
○ 2026-06-24 08:32:04
● 2026-06-24 21:13:22
○ 2026-06-26 12:53:32
● 2026-06-27 10:19:56
● 2026-06-28 20:23:34
○ 2026-06-29 07:34:20
● 2026-06-29 11:12:22
○ 2026-06-30 22:29:16
○ 2026-08-10 06:59:42

○A3.174.141.1232026-04-30 → 2026-06-29 · 24 obs

○A3.174.141.602026-04-30 → 2026-06-29 · 24 obs

○A3.174.141.832026-04-30 → 2026-06-29 · 24 obs

○A52.85.78.1162026-04-30 → 2026-08-10 · 52 obs

○ 2026-04-30 03:06:50
● 2026-04-30 11:15:18
● 2026-04-30 18:40:46
○ 2026-05-01 02:14:52
● 2026-05-02 08:26:58
○ 2026-05-03 00:28:58
○ 2026-06-07 17:50:34
● 2026-06-10 18:49:58
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○ 2026-06-17 18:20:22
● 2026-07-01 01:46:58
● 2026-07-04 21:05:16
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● 2026-07-10 13:13:56
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● 2026-07-17 03:34:50
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● 2026-07-23 11:15:02
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● 2026-07-26 23:49:34
○ 2026-07-27 02:36:54
● 2026-07-31 12:41:02
○ 2026-08-02 01:41:12
● 2026-08-02 20:08:02
○ 2026-08-02 22:05:16
● 2026-08-03 01:08:16
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● 2026-08-10 02:19:00
○ 2026-08-10 06:16:00
○ 2026-08-10 06:59:42

○A52.85.78.422026-04-30 → 2026-08-10 · 52 obs

○A52.85.78.462026-04-30 → 2026-08-10 · 52 obs

○A52.85.78.562026-04-30 → 2026-08-10 · 52 obs

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
emacourse.com	ns-287.awsdns-35.com, ns-899.awsdns-48.net, ns-1117.awsdns-11.org, ns-1748.awsdns-26.co.uk	2 records

✅ Authoritative Response

Server:205.251.193.31

NS records: ns-287.awsdns-35.com, ns-899.awsdns-48.net, ns-1117.awsdns-11.org, ns-1748.awsdns-26.co.uk

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for emacourse.com (unsigned zone)

⏱️ Timing

Total: 420ms | Queries: -

📄 Records

Type	Count	Sample Data
A	4	`18.160.46.28, 18.160.46.116...`
NS	4	`ns-1117.awsdns-11.org, ns-1748.awsdns-26.co.uk...`
SOA	1	`ns-287.awsdns-35.com awsdns-hostmaster.a`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns-287.awsdns-35.com, ns-287.awsdns-35.com)

Analysis

IP Addresses

emacourse.com directs to four IP numbers, which are 18.160.46.15, 18.160.46.28, 18.160.46.47 and 18.160.46.116.

dog(0x73686974)app.com, api-paywalls.revenuecat.com, plusholidays.com and two other host names share IP numbers with emacourse.com.

Name Servers

The authoritative name servers for emacourse.com are ns-287.awsdns-35.com, ns-899.awsdns-48.net, ns-1117.awsdns-11.org and ns-1748.awsdns-26.co.uk.

The name servers of emacourse.com overlap at least partially with those of other domains — among them snaps.com, alavie.com, career.ne.jp and two more.

Each of the four hosts ns-287.awsdns-35.com, ns-899.awsdns-48.net, ns-1117.awsdns-11.org and ns-1748.awsdns-26.co.uk has two IP addresses. ns-287.awsdns-35.com points to 205.251.193.31 and 2600:9000:5301:1f00::1. ns-899.awsdns-48.net points to 205.251.195.131 and 2600:9000:5303:8300::1. ns-1117.awsdns-11.org points to 205.251.196.93 and 2600:9000:5304:5d00::1. ns-1748.awsdns-26.co.uk points to 205.251.198.212 and 2600:9000:5306:d400::1.