pbstudy.jp - dns.ninja

`pbstudy.jp`

DNSSEC	⚠️ Not signed
A	16.76.163.174^{🇺🇸 Amazon16.76.128.0/17 EC2 Prefix}
		PTR	`ec2-16-76-163-174.ap-northeast-1.compute.amazonaws.com`
A	52.195.116.84^{🇯🇵 Amazon52.194.0.0/15 EC2 NRT prefix}
A	52.196.255.22^{🇯🇵 Amazon52.196.0.0/14 EC2 NRT prefix}
NS	`ns-1146.awsdns-15.org` ⭐
		A	2600:9000:5304:7a00::1^{🇺🇸 Amazon2600:9000:5304::/48 - CloudFront}
			PTR	`ns-1146.awsdns-15.org`
		A	205.251.196.122^{🇺🇸 Amazon205.251.196.0/24 prefix}
			PTR	`ns-1146.awsdns-15.org`
NS	`ns-1556.awsdns-02.co.uk`
		A	2600:9000:5306:1400::1^{🇺🇸 Amazon2600:9000:5306::/48 - CloudFront}
			PTR	`ns-1556.awsdns-02.co.uk`
		A	205.251.198.20^{🇺🇸 Amazon205.251.198.0/24 prefix}
			PTR	`ns-1556.awsdns-02.co.uk`
NS	`ns-44.awsdns-05.com`
		A	2600:9000:5300:2c00::1^{🇺🇸 Amazon2600:9000:5300::/48 - CloudFront}
			PTR	`ns-44.awsdns-05.com`
		A	205.251.192.44^{🇺🇸 Amazon205.251.192.0/24 prefix}
			PTR	`ns-44.awsdns-05.com`
NS	`ns-921.awsdns-51.net`
		A	2600:9000:5303:9900::1^{🇺🇸 Amazon2600:9000:5303::/48 - CloudFront}
			PTR	`ns-921.awsdns-51.net`
		A	205.251.195.153^{🇺🇸 Amazon205.251.195.0/24 prefix}
			PTR	`ns-921.awsdns-51.net`
MX	`aspmx.l.google.com` ⭐
		A	2607:f8b0:4004:c17::1a^{🇺🇸 Google2607:f8b0:4004::/48}
			PTR	`bl-in-f26.1e100.net`
		A	173.194.45.27^{🇺🇸 Google173.194.0.0/16}
			PTR	`yuiadum-in-f27.1e100.net`
MX	`alt1.aspmx.l.google.com`⁽⁵⁾
		A	2800:3f0:4003:c0f::1b^{🇨🇱 Google2800:3f0:4003::/48}
		A	108.177.123.27^{🇺🇸 Google108.177.123.0/24}
			PTR	`lcscld-in-f27.1e100.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	172.253.116.26^{🇺🇸 Google172.253.116.0/24}
			PTR	`dj-in-f26.1e100.net`
MX	`aspmx2.googlemail.com`⁽¹⁰⁾
		A	2800:3f0:4003:c0f::1a^{🇨🇱 Google2800:3f0:4003::/48}
		A	108.177.123.26^{🇺🇸 Google108.177.123.0/24}
			PTR	`lcscld-in-f26.1e100.net`
MX	`aspmx3.googlemail.com`⁽¹⁰⁾
		A	2a00:1450:400b:c02::1a^{🇮🇪 Google2a00:1450:400b::/48}
			PTR	`dj-in-f26.1e100.net`
		A	172.253.116.26^{🇺🇸 Google172.253.116.0/24}
			PTR	`dj-in-f26.1e100.net`
TXT	`google-site-verification=E_Ka3mleULn2ZgDaurdFshbMHmjvRIS2tH-iQlQnTTE`
TXT	`google-site-verification=x8vAx-FQYbPR9xzNFgWE2EUZf4IW2ftNnNu88dBfsWc`
TXT	`seculio-domain-verification-code=cb97cb920829e5c64b5c99d1c0d9db16f113bce673d2...`
TXT	`v=spf1 include:_spf.google.com include:tm.spf.cuenote.jp ~all`
SOA	`ns-1146.awsdns-15.org`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=1785311102

Same first word

pbstudy.jp

Similar names

bpstudy.com

DNS History

55 records (12 active, 43 former)

●NSns-1146.awsdns-15.org2026-02-18 → 2026-07-29 · 2 obs

● 2026-02-18 21:53:30
● 2026-07-29 09:00:44

●NSns-1556.awsdns-02.co.uk2026-02-18 → 2026-07-29 · 2 obs

● 2026-02-18 21:53:30
● 2026-07-29 09:00:44

●NSns-44.awsdns-05.com2026-02-18 → 2026-07-29 · 2 obs

● 2026-02-18 21:53:30
● 2026-07-29 09:00:44

●NSns-921.awsdns-51.net2026-02-18 → 2026-07-29 · 2 obs

● 2026-02-18 21:53:30
● 2026-07-29 09:00:44

●MXalt1.aspmx.l.google.com2026-02-18 → 2026-07-29 · 2 obs

● 2026-02-18 21:53:30
● 2026-07-29 09:00:44

●MXalt2.aspmx.l.google.com2026-02-18 → 2026-07-29 · 2 obs

● 2026-02-18 21:53:30
● 2026-07-29 09:00:44

●MXaspmx.l.google.com2026-02-18 → 2026-07-29 · 2 obs

● 2026-02-18 21:53:30
● 2026-07-29 09:00:44

●MXaspmx2.googlemail.com2026-02-18 → 2026-07-29 · 2 obs

● 2026-02-18 21:53:30
● 2026-07-29 09:00:44

●MXaspmx3.googlemail.com2026-02-18 → 2026-07-29 · 2 obs

● 2026-02-18 21:53:30
● 2026-07-29 09:00:44

○A13.112.222.1692026-05-05 → 2026-05-05 · 4 obs

○ 2026-04-29 22:10:18
● 2026-05-05 11:29:04
○ 2026-05-07 02:20:20
○ 2026-07-29 09:00:44

○A13.113.152.162026-04-29 → 2026-05-07 · 5 obs

○ 2026-04-11 09:46:00
● 2026-04-29 22:10:18
● 2026-05-07 02:20:20
○ 2026-05-13 07:51:14
○ 2026-07-29 09:00:44

○A13.114.199.522026-05-23 → 2026-05-23 · 4 obs

○ 2026-05-18 03:17:04
● 2026-05-23 02:21:32
○ 2026-06-02 04:56:12
○ 2026-07-29 09:00:44

○A13.114.252.2232026-02-18 → 2026-07-29 · 2 obs

○ 2026-02-18 21:53:30
○ 2026-07-29 09:00:44

○A13.158.121.2332026-03-05 → 2026-03-05 · 4 obs

○ 2026-02-24 18:53:34
● 2026-03-05 11:14:32
○ 2026-03-18 21:01:10
○ 2026-07-29 09:00:44

○A13.192.120.1072026-05-13 → 2026-05-13 · 4 obs

○ 2026-05-07 02:20:20
● 2026-05-13 07:51:14
○ 2026-05-14 09:02:28
○ 2026-07-29 09:00:44

○A13.192.14.2532026-03-18 → 2026-03-23 · 5 obs

○ 2026-03-05 11:14:32
● 2026-03-18 21:01:10
● 2026-03-23 05:51:52
○ 2026-04-09 22:58:28
○ 2026-07-29 09:00:44

○A13.193.105.812026-04-11 → 2026-04-11 · 4 obs

○ 2026-04-09 22:58:28
● 2026-04-11 09:46:00
○ 2026-04-29 22:10:18
○ 2026-07-29 09:00:44

○A13.193.191.2222026-03-18 → 2026-03-23 · 5 obs

○ 2026-03-05 11:14:32
● 2026-03-18 21:01:10
● 2026-03-23 05:51:52
○ 2026-04-09 22:58:28
○ 2026-07-29 09:00:44

○A13.193.20.512026-05-05 → 2026-05-07 · 5 obs

○ 2026-04-29 22:10:18
● 2026-05-05 11:29:04
● 2026-05-07 02:20:20
○ 2026-05-13 07:51:14
○ 2026-07-29 09:00:44

○A13.193.72.882026-05-23 → 2026-06-02 · 5 obs

○ 2026-05-18 03:17:04
● 2026-05-23 02:21:32
● 2026-06-02 04:56:12
○ 2026-06-08 14:19:14
○ 2026-07-29 09:00:44

○A13.230.141.2262026-02-24 → 2026-02-24 · 4 obs

○ 2026-02-18 21:53:30
● 2026-02-24 18:53:34
○ 2026-03-05 11:14:32
○ 2026-07-29 09:00:44

○A13.230.202.562026-04-09 → 2026-04-11 · 5 obs

○ 2026-03-23 05:51:52
● 2026-04-09 22:58:28
● 2026-04-11 09:46:00
○ 2026-04-29 22:10:18
○ 2026-07-29 09:00:44

●A16.76.163.1742026-07-29 → 2026-07-29 · 2 obs

○ 2026-06-20 10:58:38
● 2026-07-29 09:00:44

○A18.176.120.22026-04-29 → 2026-04-29 · 4 obs

○ 2026-04-11 09:46:00
● 2026-04-29 22:10:18
○ 2026-05-05 11:29:04
○ 2026-07-29 09:00:44

○A18.178.24.1382026-06-02 → 2026-06-02 · 4 obs

○ 2026-05-23 02:21:32
● 2026-06-02 04:56:12
○ 2026-06-08 14:19:14
○ 2026-07-29 09:00:44

○A18.179.220.1402026-05-14 → 2026-05-14 · 4 obs

○ 2026-05-13 07:51:14
● 2026-05-14 09:02:28
○ 2026-05-15 09:07:30
○ 2026-07-29 09:00:44

○A18.180.146.1842026-05-15 → 2026-05-18 · 5 obs

○ 2026-05-14 09:02:28
● 2026-05-15 09:07:30
● 2026-05-18 03:17:04
○ 2026-05-23 02:21:32
○ 2026-07-29 09:00:44

○A18.180.202.62026-05-07 → 2026-05-07 · 4 obs

○ 2026-05-05 11:29:04
● 2026-05-07 02:20:20
○ 2026-05-13 07:51:14
○ 2026-07-29 09:00:44

○A18.182.197.1062026-04-29 → 2026-04-29 · 4 obs

○ 2026-04-11 09:46:00
● 2026-04-29 22:10:18
○ 2026-05-05 11:29:04
○ 2026-07-29 09:00:44

○A3.114.202.1642026-03-18 → 2026-03-23 · 5 obs

○ 2026-03-05 11:14:32
● 2026-03-18 21:01:10
● 2026-03-23 05:51:52
○ 2026-04-09 22:58:28
○ 2026-07-29 09:00:44

○A35.72.123.222026-05-13 → 2026-05-14 · 5 obs

○ 2026-05-07 02:20:20
● 2026-05-13 07:51:14
● 2026-05-14 09:02:28
○ 2026-05-15 09:07:30
○ 2026-07-29 09:00:44

○A35.73.109.1412026-04-09 → 2026-04-11 · 5 obs

○ 2026-03-23 05:51:52
● 2026-04-09 22:58:28
● 2026-04-11 09:46:00
○ 2026-04-29 22:10:18
○ 2026-07-29 09:00:44

○A35.75.146.2322026-05-13 → 2026-05-13 · 4 obs

○ 2026-05-07 02:20:20
● 2026-05-13 07:51:14
○ 2026-05-14 09:02:28
○ 2026-07-29 09:00:44

○A35.75.248.2412026-06-02 → 2026-06-02 · 4 obs

○ 2026-05-23 02:21:32
● 2026-06-02 04:56:12
○ 2026-06-08 14:19:14
○ 2026-07-29 09:00:44

○A35.79.112.2022026-06-20 → 2026-06-20 · 3 obs

○ 2026-06-08 14:19:14
● 2026-06-20 10:58:38
○ 2026-07-29 09:00:44

○A35.79.148.462026-05-14 → 2026-05-16 · 5 obs

○ 2026-05-13 07:51:14
● 2026-05-14 09:02:28
● 2026-05-16 01:23:40
○ 2026-05-18 03:17:04
○ 2026-07-29 09:00:44

○A52.193.209.742026-03-05 → 2026-03-05 · 4 obs

○ 2026-02-24 18:53:34
● 2026-03-05 11:14:32
○ 2026-03-18 21:01:10
○ 2026-07-29 09:00:44

○A52.193.78.1322026-02-18 → 2026-02-18 · 3 obs

● 2026-02-18 21:53:30
○ 2026-02-24 18:53:34
○ 2026-07-29 09:00:44

○A52.194.132.1042026-05-18 → 2026-05-23 · 5 obs

○ 2026-05-16 01:23:40
● 2026-05-18 03:17:04
● 2026-05-23 02:21:32
○ 2026-06-02 04:56:12
○ 2026-07-29 09:00:44

○A52.194.60.822026-03-05 → 2026-03-05 · 4 obs

○ 2026-02-24 18:53:34
● 2026-03-05 11:14:32
○ 2026-03-18 21:01:10
○ 2026-07-29 09:00:44

●A52.195.116.842026-07-29 → 2026-07-29 · 2 obs

○ 2026-06-20 10:58:38
● 2026-07-29 09:00:44

●A52.196.255.222026-07-29 → 2026-07-29 · 2 obs

○ 2026-06-20 10:58:38
● 2026-07-29 09:00:44

○A52.198.67.1352026-05-15 → 2026-05-16 · 5 obs

○ 2026-05-14 09:02:28
● 2026-05-15 09:07:30
● 2026-05-16 01:23:40
○ 2026-05-18 03:17:04
○ 2026-07-29 09:00:44

○A52.199.144.1352026-06-08 → 2026-06-08 · 4 obs

○ 2026-06-02 04:56:12
● 2026-06-08 14:19:14
○ 2026-06-20 10:58:38
○ 2026-07-29 09:00:44

○A52.199.246.1562026-02-18 → 2026-07-29 · 2 obs

○ 2026-02-18 21:53:30
○ 2026-07-29 09:00:44

○A52.68.145.2172026-06-20 → 2026-06-20 · 3 obs

○ 2026-06-08 14:19:14
● 2026-06-20 10:58:38
○ 2026-07-29 09:00:44

○A52.69.214.382026-06-08 → 2026-06-08 · 4 obs

○ 2026-06-02 04:56:12
● 2026-06-08 14:19:14
○ 2026-06-20 10:58:38
○ 2026-07-29 09:00:44

○A54.150.253.652026-06-20 → 2026-06-20 · 3 obs

○ 2026-06-08 14:19:14
● 2026-06-20 10:58:38
○ 2026-07-29 09:00:44

○A54.199.128.2112026-04-09 → 2026-04-09 · 4 obs

○ 2026-03-23 05:51:52
● 2026-04-09 22:58:28
○ 2026-04-11 09:46:00
○ 2026-07-29 09:00:44

○A54.238.42.272026-06-08 → 2026-06-08 · 4 obs

○ 2026-06-02 04:56:12
● 2026-06-08 14:19:14
○ 2026-06-20 10:58:38
○ 2026-07-29 09:00:44

○A54.249.205.322026-02-18 → 2026-07-29 · 2 obs

○ 2026-02-18 21:53:30
○ 2026-07-29 09:00:44

○A54.92.42.1852026-05-18 → 2026-05-18 · 4 obs

○ 2026-05-16 01:23:40
● 2026-05-18 03:17:04
○ 2026-05-23 02:21:32
○ 2026-07-29 09:00:44

○A57.180.157.1652026-02-24 → 2026-02-24 · 4 obs

○ 2026-02-18 21:53:30
● 2026-02-24 18:53:34
○ 2026-03-05 11:14:32
○ 2026-07-29 09:00:44

○A57.181.250.822026-02-18 → 2026-02-18 · 3 obs

● 2026-02-18 21:53:30
○ 2026-02-24 18:53:34
○ 2026-07-29 09:00:44

○A57.182.194.192026-02-18 → 2026-02-24 · 4 obs

● 2026-02-18 21:53:30
● 2026-02-24 18:53:34
○ 2026-03-05 11:14:32
○ 2026-07-29 09:00:44

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
jp	a.dns.jp, b.dns.jp, c.dns.jp, d.dns.jp...	-
pbstudy.jp	ns-44.awsdns-05.com, ns-921.awsdns-51.net, ns-1146.awsdns-15.org, ns-1556.awsdns-02.co.uk	-

✅ Authoritative Response

Server:205.251.198.20

NS records: ns-44.awsdns-05.com, ns-921.awsdns-51.net, ns-1146.awsdns-15.org, ns-1556.awsdns-02.co.uk

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for pbstudy.jp (unsigned zone)

⏱️ Timing

Total: 965ms | Queries: -

📄 Records

Type	Count	Sample Data
A	3	`52.196.255.22, 52.195.116.84...`
NS	4	`ns-1146.awsdns-15.org, ns-1556.awsdns-02.co.uk...`
MX	5	`aspmx.l.google.com (pri: 1), aspmx2.googlemail.com (pri: 10)...`
TXT	4	`google-site-verification=E_Ka3mleULn2ZgD, google-site-verification=x8vAx-FQYbPR9xz...`
SOA	1	`ns-1146.awsdns-15.org awsdns-hostmaster.`

Analysis

IP Addresses

pbstudy.jp points to three IP numbers, namely 16.76.163.174, 52.195.116.84 and 52.196.255.22.

Name Servers

The authoritative name servers for pbstudy.jp are ns-44.awsdns-05.com, ns-921.awsdns-51.net, ns-1146.awsdns-15.org and ns-1556.awsdns-02.co.uk.

At least some of pbstudy.jp's name servers are shared with other domains, for example trinitysoftballcamps.com, kenmas.com, fanlive.tv and two more.

Four hostnames, each resolving to a pair of IP addresses: ns-44.awsdns-05.com directs to 205.251.192.44 and 2600:9000:5300:2c00::1; ns-921.awsdns-51.net directs to 205.251.195.153 and 2600:9000:5303:9900::1; ns-1146.awsdns-15.org directs to 205.251.196.122 and 2600:9000:5304:7a00::1; ns-1556.awsdns-02.co.uk directs to 205.251.198.20 and 2600:9000:5306:1400::1.

Mail Servers

pbstudy.jp has five mail servers, which are aspmx2.googlemail.com, aspmx3.googlemail.com, aspmx.l.google.com and two others.

pbstudy.jp has at least partial mail server overlap with other domains such as aurielectric.com, triscinamare.com, syftanalytics.com and two more.

These mail servers commonly co-occur with mail servers alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, alt3.aspmx.l.google.com and 3 others.

Hostnames that resolve to two IP addresses:

aspmx2.googlemail.com resolves to two addresses: 108.177.123.26 and 2800:3f0:4003:c0f::1a.

aspmx3.googlemail.com resolves to two addresses: 172.253.116.26 and 2a00:1450:400b:c02::1a.

aspmx.l.google.com resolves to two addresses: 173.194.45.27 and 2607:f8b0:4004:c17::1a.

alt1.aspmx.l.google.com resolves to two addresses: 108.177.123.27 and 2800:3f0:4003:c0f::1b.

alt2.aspmx.l.google.com resolves to two addresses: 172.253.116.26 and 2a00:1450:400b:c02::1a.

aspmx3.googlemail.com along with alt2.aspmx.l.google.com each resolve to 2a00:1450:400b:c02::1a IP addresses.

aspmx3.googlemail.com along with alt2.aspmx.l.google.com each resolve to 172.253.116.26 IP addresses.