studyhacker.jp - dns.ninja

`studyhacker.jp`

DNSSEC	⚠️ Not signed
A	13.192.6.144^{🇺🇸 Amazon13.192.0.0/16 EC2 NRT prefix}
		PTR	`ec2-13-192-6-144.ap-northeast-1.compute.amazonaws.com`
A	16.76.81.189^{🇺🇸 Amazon16.76.0.0/17 EC2 Prefix}
A	57.182.5.225^{🇯🇵 Amazon57.180.0.0/14 EC2}
NS	`ns-97.awsdns-12.com` ⭐
		A	2600:9000:5300:6100::1^{🇺🇸 Amazon2600:9000:5300::/48 - CloudFront}
			PTR	`ns-97.awsdns-12.com`
		A	205.251.192.97^{🇺🇸 Amazon205.251.192.0/24 prefix}
			PTR	`ns-97.awsdns-12.com`
NS	`ns-1338.awsdns-39.org`
		A	2600:9000:5305:3a00::1^{🇺🇸 Amazon2600:9000:5305::/48 - CloudFront}
			PTR	`ns-1338.awsdns-39.org`
		A	205.251.197.58^{🇺🇸 Amazon205.251.197.0/24 prefix}
			PTR	`ns-1338.awsdns-39.org`
NS	`ns-1739.awsdns-25.co.uk`
		A	2600:9000:5306:cb00::1^{🇺🇸 Amazon2600:9000:5306::/48 - CloudFront}
			PTR	`ns-1739.awsdns-25.co.uk`
		A	205.251.198.203^{🇺🇸 Amazon205.251.198.0/24 prefix}
			PTR	`ns-1739.awsdns-25.co.uk`
NS	`ns-859.awsdns-43.net`
		A	2600:9000:5303:5b00::1^{🇺🇸 Amazon2600:9000:5303::/48 - CloudFront}
			PTR	`ns-859.awsdns-43.net`
		A	205.251.195.91^{🇺🇸 Amazon205.251.195.0/24 prefix}
			PTR	`ns-859.awsdns-43.net`
MX	`aspmx.l.google.com` ⭐
		A	2607:f8b0:4004:c0b::1b^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`bj-in-f27.1e100.net`
		A	142.251.163.27^{🇺🇸 Google142.251.163.0/24}
			PTR	`wv-in-f27.1e100.net`
MX	`alt1.aspmx.l.google.com`⁽⁵⁾
		A	2800:3f0:4003:c0f::1b^{🇨🇱 Google2800:3f0:4003::/48}
		A	108.177.123.26^{🇺🇸 Google108.177.123.0/24}
			PTR	`lcscld-in-f26.1e100.net`
MX	`alt2.aspmx.l.google.com`⁽⁵⁾
		A	2a00:1450:400b:c02::1a^{🇮🇪 Google2a00:1450:400b::/48}
			PTR	`dj-in-f26.1e100.net`
		A	172.253.116.27^{🇺🇸 Google172.253.116.0/24}
			PTR	`dj-in-f27.1e100.net`
MX	`alt3.aspmx.l.google.com`⁽¹⁰⁾
		A	2a00:1450:4009:c0f::1a^{🇬🇧 Google2a00:1450:4009::/48}
			PTR	`yulhrs-in-f26.1e100.net`
		A	192.178.223.27^{🇺🇸 Google192.178.223.0/24}
			PTR	`yulhrs-in-f27.1e100.net`
MX	`alt4.aspmx.l.google.com`⁽¹⁰⁾
		A	2a00:1450:400c:c23::1b^{🇧🇪 Google2a00:1450:400c::/48}
			PTR	`yubrupd-in-f27.1e100.net`
		A	172.253.157.27^{🇺🇸 Google172.253.0.0/16}
			PTR	`yubrupd-in-f27.1e100.net`
TXT	`MS=144F489FA8CFE4F23FBF0A60E61CAF9B51042C4A`
TXT	`MS=ms41138946`
TXT	`apple-domain-verification=F9SSwEd4PmRp9LVW`
TXT	`google-site-verification=U2l3BjdEI0CZE-3zebxbuy6pCVQQrvFWR_hdpsnfTw0`
TXT	`v=spf1 include:_spf.google.com include:_spf.ptsc.jp ~all`
SOA	`ns-97.awsdns-12.com`awsdns-hostmaster@amazon.com serial=1

`jp`

	DNSSEC	🔒 Signed (DS record present)
	NS	`z.dns.jp` ⭐
	NS	`a.dns.jp`
	NS	`b.dns.jp`
	NS	`c.dns.jp`
	NS	`d.dns.jp`
	NS	`e.dns.jp`
	NS	`f.dns.jp`
	NS	`g.dns.jp`
	NS	`h.dns.jp`
	SOA	`z.dns.jp`root@dns.jp serial=1782862203

🔒 HSTS Preload (+subdomains)

Same first word

studyhacker.net

studyhacker.jp

DNS History

29 records (12 active, 17 former)

●NSns-1338.awsdns-39.org2020-02-20 → 2026-06-30 · 2 obs

● 2020-02-20 18:22:46
● 2026-06-30 23:38:08

●NSns-1739.awsdns-25.co.uk2020-02-20 → 2026-06-30 · 2 obs

● 2020-02-20 18:22:46
● 2026-06-30 23:38:08

●NSns-859.awsdns-43.net2020-02-20 → 2026-06-30 · 2 obs

● 2020-02-20 18:22:46
● 2026-06-30 23:38:08

●NSns-97.awsdns-12.com2020-02-20 → 2026-06-30 · 2 obs

● 2020-02-20 18:22:46
● 2026-06-30 23:38:08

●MXalt1.aspmx.l.google.com2020-02-20 → 2026-06-30 · 2 obs

● 2020-02-20 18:22:46
● 2026-06-30 23:38:08

●MXalt2.aspmx.l.google.com2020-02-20 → 2026-06-30 · 2 obs

● 2020-02-20 18:22:46
● 2026-06-30 23:38:08

●MXalt3.aspmx.l.google.com2020-02-20 → 2026-06-30 · 2 obs

● 2020-02-20 18:22:46
● 2026-06-30 23:38:08

●MXalt4.aspmx.l.google.com2020-02-20 → 2026-06-30 · 2 obs

● 2020-02-20 18:22:46
● 2026-06-30 23:38:08

●MXaspmx.l.google.com2020-02-20 → 2026-06-30 · 2 obs

● 2020-02-20 18:22:46
● 2026-06-30 23:38:08

○A13.112.112.692026-03-28 → 2026-03-29 · 5 obs

○ 2026-02-22 15:18:22
● 2026-03-28 20:10:34
● 2026-03-29 18:54:24
○ 2026-04-27 12:19:16
○ 2026-06-30 23:38:08

●A13.192.6.1442026-06-30 → 2026-06-30 · 2 obs

○ 2026-05-31 01:01:24
● 2026-06-30 23:38:08

○A13.193.98.632026-04-27 → 2026-04-27 · 4 obs

○ 2026-03-29 18:54:24
● 2026-04-27 12:19:16
○ 2026-05-31 01:01:24
○ 2026-06-30 23:38:08

●A16.76.81.1892026-06-30 → 2026-06-30 · 2 obs

○ 2026-05-31 01:01:24
● 2026-06-30 23:38:08

○A3.113.37.232026-02-22 → 2026-06-30 · 2 obs

○ 2026-02-22 15:18:22
○ 2026-06-30 23:38:08

○A3.115.70.32026-03-28 → 2026-03-29 · 5 obs

○ 2026-02-22 15:18:22
● 2026-03-28 20:10:34
● 2026-03-29 18:54:24
○ 2026-04-27 12:19:16
○ 2026-06-30 23:38:08

○A35.72.192.2232026-02-22 → 2026-02-22 · 4 obs

○ 2020-02-20 18:22:46
● 2026-02-22 15:18:22
○ 2026-03-28 20:10:34
○ 2026-06-30 23:38:08

○A35.73.114.682026-02-22 → 2026-02-22 · 4 obs

○ 2020-02-20 18:22:46
● 2026-02-22 15:18:22
○ 2026-03-28 20:10:34
○ 2026-06-30 23:38:08

○A35.73.182.612026-02-22 → 2026-02-22 · 4 obs

○ 2020-02-20 18:22:46
● 2026-02-22 15:18:22
○ 2026-03-28 20:10:34
○ 2026-06-30 23:38:08

○A35.74.148.2172026-05-31 → 2026-05-31 · 3 obs

○ 2026-04-27 12:19:16
● 2026-05-31 01:01:24
○ 2026-06-30 23:38:08

○A35.76.192.1602026-05-31 → 2026-05-31 · 3 obs

○ 2026-04-27 12:19:16
● 2026-05-31 01:01:24
○ 2026-06-30 23:38:08

○A35.77.145.1432026-02-22 → 2026-06-30 · 2 obs

○ 2026-02-22 15:18:22
○ 2026-06-30 23:38:08

○A35.78.17.882026-04-27 → 2026-04-27 · 4 obs

○ 2026-03-29 18:54:24
● 2026-04-27 12:19:16
○ 2026-05-31 01:01:24
○ 2026-06-30 23:38:08

○A52.196.195.2252020-02-20 → 2020-02-20 · 3 obs

● 2020-02-20 18:22:46
○ 2026-02-22 15:18:22
○ 2026-06-30 23:38:08

○A54.168.212.2242026-05-31 → 2026-05-31 · 3 obs

○ 2026-04-27 12:19:16
● 2026-05-31 01:01:24
○ 2026-06-30 23:38:08

○A54.168.219.1562026-04-27 → 2026-04-27 · 4 obs

○ 2026-03-29 18:54:24
● 2026-04-27 12:19:16
○ 2026-05-31 01:01:24
○ 2026-06-30 23:38:08

○A54.178.166.2042020-02-20 → 2020-02-20 · 3 obs

● 2020-02-20 18:22:46
○ 2026-02-22 15:18:22
○ 2026-06-30 23:38:08

○A54.64.192.1102026-03-28 → 2026-03-29 · 5 obs

○ 2026-02-22 15:18:22
● 2026-03-28 20:10:34
● 2026-03-29 18:54:24
○ 2026-04-27 12:19:16
○ 2026-06-30 23:38:08

○A54.65.81.572026-02-22 → 2026-06-30 · 2 obs

○ 2026-02-22 15:18:22
○ 2026-06-30 23:38:08

●A57.182.5.2252026-06-30 → 2026-06-30 · 2 obs

○ 2026-05-31 01:01:24
● 2026-06-30 23:38:08

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
jp	b.dns.jp, c.dns.jp, d.dns.jp, e.dns.jp...	-
studyhacker.jp	ns-1739.awsdns-25.co.uk, ns-97.awsdns-12.com, ns-859.awsdns-43.net, ns-1338.awsdns-39.org	-

✅ Authoritative Response

Server:205.251.195.91

NS records: ns-1739.awsdns-25.co.uk, ns-97.awsdns-12.com, ns-859.awsdns-43.net, ns-1338.awsdns-39.org

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for studyhacker.jp (unsigned zone)

⏱️ Timing

Total: 1239ms | Queries: -

📄 Records

Type	Count	Sample Data
A	3	`13.192.6.144, 57.182.5.225...`
NS	4	`ns-1338.awsdns-39.org, ns-1739.awsdns-25.co.uk...`
MX	5	`aspmx.l.google.com (pri: 1), alt3.aspmx.l.google.com (pri: 10)...`
TXT	5	`MS=144F489FA8CFE4F23FBF0A60E61CAF9B51042, MS=ms41138946...`
SOA	1	`ns-97.awsdns-12.com awsdns-hostmaster.am`

Analysis

IP Addresses

studyhacker.jp directs to three IP numbers: 13.192.6.144, 16.76.81.189 and 57.182.5.225.

Further host names like studyhacker.net and ec2-57-182-5-225.ap-northeast-1.compute.amazonaws.com overlap in IP numbers with studyhacker.jp.

Name Servers

The authoritative name servers for studyhacker.jp are ns-97.awsdns-12.com, ns-859.awsdns-43.net, ns-1338.awsdns-39.org and ns-1739.awsdns-25.co.uk.

There is at least partial name server overlap between studyhacker.jp and other domains — echonews.com, kitu.io, creaxa.com and two more among them.

All four hostnames — ns-97.awsdns-12.com, ns-859.awsdns-43.net, ns-1338.awsdns-39.org and ns-1739.awsdns-25.co.uk — resolve to two IP numbers apiece: ns-97.awsdns-12.com to 205.251.192.97 and 2600:9000:5300:6100::1; ns-859.awsdns-43.net to 205.251.195.91 and 2600:9000:5303:5b00::1; ns-1338.awsdns-39.org to 205.251.197.58 and 2600:9000:5305:3a00::1; ns-1739.awsdns-25.co.uk to 205.251.198.203 and 2600:9000:5306:cb00::1.

Mail Servers

studyhacker.jp has five mail servers, which are aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com and two others.

studyhacker.jp has at least partial mail server overlap with other domains such as ns500698.ns500759.ns500698.ns500698.ns500759.ns500735.ns500736.ns500735.ns500735.ns500735.ns500735.ns500698.ns500708.ns500576.ns500686.ns500576.ns500619.trackreceptor.com, edventure.ro, drnesterenko.com and two more.

These mail servers commonly co-occur with mail servers alt3.aspmx.l.google.com, alt4.aspmx.l.google.com, aspmx2.googlemail.com and 3 others.

Hostnames that resolve to two IP addresses:

aspmx.l.google.com points to 142.251.163.27 and 2607:f8b0:4004:c0b::1b.

alt1.aspmx.l.google.com points to 108.177.123.26 and 2800:3f0:4003:c0f::1b.

alt2.aspmx.l.google.com points to 172.253.116.27 and 2a00:1450:400b:c02::1a.

alt3.aspmx.l.google.com points to 192.178.223.27 and 2a00:1450:4009:c0f::1a.

alt4.aspmx.l.google.com points to 172.253.157.27 and 2a00:1450:400c:c23::1b.