katugaku.com - robtex.com

katugaku.com

DNSSEC⚠️ Not signed
A183.181.97.27🇯🇵 XSERVER-AS183.181.96.0/23 XSERVER Inc.
PTRsv7026.xserver.jp
NSns1.xserver.jp ⭐
A202.226.36.164🇯🇵 XSERVER-AS202.226.36.0/22 XSERVER Inc.
A202.226.36.170🇯🇵 XSERVER-AS202.226.36.0/22 XSERVER Inc.
A202.226.36.246🇯🇵 XSERVER-AS202.226.36.0/22 XSERVER Inc.
PTRns1.xserver.jp
NSns2.xserver.jp
A35.72.43.26🇯🇵 Amazon35.72.0.0/13 EC2 NRT prefix
PTRns2.xserver.jp
NSns3.xserver.jp
A202.226.36.247🇯🇵 XSERVER-AS202.226.36.0/22 XSERVER Inc.
PTRns3.xserver.jp
NSns4.xserver.jp
A183.90.224.226🇯🇵 XSERVER-AS183.90.224.0/20 XSERVER Inc.
A183.90.224.230🇯🇵 XSERVER-AS183.90.224.0/20 XSERVER Inc.
A202.226.39.247🇯🇵 XSERVER-AS202.226.36.0/22 XSERVER Inc.
PTRns4.xserver.jp
NSns5.xserver.jp
A157.112.182.218🇯🇵 XSERVER-AS157.112.176.0/21 XSERVER Inc.
A157.112.182.220🇯🇵 XSERVER-AS157.112.176.0/21 XSERVER Inc.
A202.226.37.247🇯🇵 XSERVER-AS202.226.36.0/22 XSERVER Inc.
PTRns5.xserver.jp
MXkatugaku.com ⭐
A183.181.97.27🇯🇵 XSERVER-AS183.181.96.0/23 XSERVER Inc.
PTRsv7026.xserver.jp
TXTv=spf1 +a:sv7026.xserver.jp +a:katugaku.com +mx include:spf.sender.xserver.jp...
SOAns1.xserver.jproot@xserver.jp serial=0

com

DNSSEC🔒 Signed (DS record present)
NSa.gtld-servers.net ⭐
NSb.gtld-servers.net
NSc.gtld-servers.net
NSd.gtld-servers.net
NSe.gtld-servers.net
NSf.gtld-servers.net
NSg.gtld-servers.net
NSh.gtld-servers.net
NSi.gtld-servers.net
NSj.gtld-servers.net
NSk.gtld-servers.net
NSl.gtld-servers.net
NSm.gtld-servers.net
SOAa.gtld-servers.netnstld@verisign-grs.com serial=1778570291

MX for

katugaku.com

Subdomains

www.katugaku.com

Same first word

katugaku.com

DNS History

13 records (7 active, 6 former)

200920112013201520172019202120232025NSns1.xserver.jpns2.xserver.jpns3.xserver.jpns4.xserver.jpns5.xserver.jpns169.japansecurity.netns190.japansecurity.netMXkatugaku.commail.katugaku.comA183.181.97.27203.137.94.8203.167.40.10211.8.19.60
●NSns1.xserver.jp2026-03-08 → 2026-05-12 · 3 obs
○ 2019-04-11 06:11:14
● 2026-03-08 14:49:28
● 2026-05-12 07:44:52
○NSns169.japansecurity.net2015-08-11 → 2016-06-18 · 7 obs
○ 2008-03-20 13:07:10
● 2015-08-11 00:58:58
● 2015-11-30 07:34:50
○ 2016-02-28 04:51:52
● 2016-06-18 09:26:06
○ 2017-01-24 13:01:20
○ 2026-05-12 07:44:52
○NSns190.japansecurity.net2015-08-11 → 2019-04-11 · 9 obs
○ 2008-03-20 13:07:10
● 2015-08-11 00:58:58
○ 2015-11-30 07:34:50
● 2016-02-28 04:51:52
○ 2016-06-18 09:26:06
● 2017-01-24 13:01:20
● 2019-04-11 06:11:14
○ 2026-03-08 14:49:28
○ 2026-05-12 07:44:52
●NSns2.xserver.jp2026-03-08 → 2026-05-12 · 3 obs
○ 2019-04-11 06:11:14
● 2026-03-08 14:49:28
● 2026-05-12 07:44:52
●NSns3.xserver.jp2026-03-08 → 2026-05-12 · 3 obs
○ 2019-04-11 06:11:14
● 2026-03-08 14:49:28
● 2026-05-12 07:44:52
●NSns4.xserver.jp2026-03-08 → 2026-05-12 · 3 obs
○ 2019-04-11 06:11:14
● 2026-03-08 14:49:28
● 2026-05-12 07:44:52
●NSns5.xserver.jp2026-03-08 → 2026-05-12 · 3 obs
○ 2019-04-11 06:11:14
● 2026-03-08 14:49:28
● 2026-05-12 07:44:52
●MXkatugaku.com2026-03-08 → 2026-05-12 · 3 obs
○ 2019-04-11 06:11:14
● 2026-03-08 14:49:28
● 2026-05-12 07:44:52
○MXmail.katugaku.com2015-08-11 → 2019-04-11 · 5 obs
○ 2008-03-20 13:07:10
● 2015-08-11 00:58:58
● 2019-04-11 06:11:14
○ 2026-03-08 14:49:28
○ 2026-05-12 07:44:52
●A183.181.97.272026-03-08 → 2026-05-12 · 3 obs
○ 2019-04-11 06:11:14
● 2026-03-08 14:49:28
● 2026-05-12 07:44:52
○A203.137.94.82015-11-30 → 2019-04-11 · 5 obs
○ 2015-08-11 00:58:58
● 2015-11-30 07:34:50
● 2019-04-11 06:11:14
○ 2026-03-08 14:49:28
○ 2026-05-12 07:44:52
○A203.167.40.102008-03-20 → 2008-03-20 · 3 obs
● 2008-03-20 13:07:10
○ 2015-08-11 00:58:58
○ 2026-05-12 07:44:52
○A211.8.19.602015-08-11 → 2015-08-11 · 4 obs
○ 2008-03-20 13:07:10
● 2015-08-11 00:58:58
○ 2015-11-30 07:34:50
○ 2026-05-12 07:44:52

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
comk.gtld-servers.net, h.gtld-servers.net, b.gtld-servers.net, i.gtld-servers.net...-
katugaku.comns1.xserver.jp, ns2.xserver.jp, ns3.xserver.jp, ns4.xserver.jp...-

✅ Authoritative Response

Server:202.226.39.247

NS records: ns1.xserver.jp, ns2.xserver.jp, ns3.xserver.jp, ns4.xserver.jp, ns5.xserver.jp

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for katugaku.com (unsigned zone)

⏱️ Timing

Total: 2076ms | Queries: -

📄 Records

TypeCountSample Data
A1183.181.97.27
NS5ns1.xserver.jp, ns3.xserver.jp...
MX1katugaku.com (pri: 0)
TXT1v=spf1 +a:sv7026.xserver.jp +a:katugaku.
SOA1ns1.xserver.jp root.xserver.jp

Analysis

Hierarchy

katugaku.com is the parent of www.katugaku.com.

Mail Server Role

For katugaku.com, the mail server is katugaku.com.

IP Addresses

katugaku.com resolves to one IP number: 183.181.97.27.

other host names including sv7026.xserver.jp, hirosifarm.com, marumitu.com, ryohirano.com and www.hahatokotime.com share IP numbers with katugaku.com.

Name Servers

katugaku.com is delegated to five name servers: ns1.xserver.jp, ns2.xserver.jp, ns3.xserver.jp, ns4.xserver.jp and ns5.xserver.jp.

katugaku.com at least partially shares name servers with other domains, for instance expnavi.com, toyama-up.com, pablo.jp, massans7.com and koki-hp.com.

Host names with three IP numbers:

ns1.xserver.jp points to: 202.226.36.164, 202.226.36.170 and 202.226.36.246; ns4.xserver.jp points to: 183.90.224.226, 183.90.224.230 and 202.226.39.247; ns5.xserver.jp points to: 157.112.182.218, 157.112.182.220 and 202.226.37.247.

Host names with one IP number:

ns2.xserver.jp points to: 35.72.43.26; ns3.xserver.jp points to: 202.226.36.247.

Mail Servers

katugaku.com is served by a single mail server, katugaku.com.

katugaku.com resolves to IP 183.181.97.27.