course-db.com - robtex.com

course-db.com

DNSSEC⚠️ Not signed
A162.43.94.65🇯🇵 XSERVER-AS162.43.0.0/17 XSERVER Inc.
PTRsv15064.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
MXcourse-db.com ⭐
A162.43.94.65🇯🇵 XSERVER-AS162.43.0.0/17 XSERVER Inc.
PTRsv15064.xserver.jp
TXTv=spf1 +a:sv15064.xserver.jp +a:course-db.com +mx include:spf.sender.xserver....
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=1775977587

MX for

course-db.com

Same first word

course-db.com

Similar names

uber-docs.com

DNS History

13 records (7 active, 6 former)

200920112013201520172019202120232025NSns1.xserver.jpns2.xserver.jpns3.xserver.jpns4.xserver.jpns5.xserver.jpns57.domaincontrol.comns58.domaincontrol.comMXcourse-db.commailstore1.secureserver.netsmtp.secureserver.netA162.43.94.6550.63.202.6068.178.232.100
●NSns1.xserver.jp2026-02-28 → 2026-04-12 · 3 obs
○ 2015-11-06 20:56:22
● 2026-02-28 20:07:56
● 2026-04-12 07:19:30
●NSns2.xserver.jp2026-02-28 → 2026-04-12 · 3 obs
○ 2015-11-06 20:56:22
● 2026-02-28 20:07:56
● 2026-04-12 07:19:30
●NSns3.xserver.jp2026-02-28 → 2026-04-12 · 3 obs
○ 2015-11-06 20:56:22
● 2026-02-28 20:07:56
● 2026-04-12 07:19:30
●NSns4.xserver.jp2026-02-28 → 2026-04-12 · 3 obs
○ 2015-11-06 20:56:22
● 2026-02-28 20:07:56
● 2026-04-12 07:19:30
●NSns5.xserver.jp2026-02-28 → 2026-04-12 · 3 obs
○ 2015-11-06 20:56:22
● 2026-02-28 20:07:56
● 2026-04-12 07:19:30
○NSns57.domaincontrol.com2008-03-07 → 2015-06-23 · 4 obs
● 2008-03-07 18:32:34
● 2015-06-23 11:59:56
○ 2015-11-06 20:56:22
○ 2026-04-12 07:19:30
○NSns58.domaincontrol.com2008-03-07 → 2015-06-23 · 4 obs
● 2008-03-07 18:32:34
● 2015-06-23 11:59:56
○ 2015-11-06 20:56:22
○ 2026-04-12 07:19:30
●MXcourse-db.com2026-02-28 → 2026-04-12 · 3 obs
○ 2015-11-06 20:56:22
● 2026-02-28 20:07:56
● 2026-04-12 07:19:30
○MXmailstore1.secureserver.net2008-03-07 → 2015-06-23 · 4 obs
● 2008-03-07 18:32:34
● 2015-06-23 11:59:56
○ 2015-11-06 20:56:22
○ 2026-04-12 07:19:30
○MXsmtp.secureserver.net2008-03-07 → 2015-06-23 · 4 obs
● 2008-03-07 18:32:34
● 2015-06-23 11:59:56
○ 2015-11-06 20:56:22
○ 2026-04-12 07:19:30
●A162.43.94.652026-02-28 → 2026-04-12 · 3 obs
○ 2015-11-06 20:56:22
● 2026-02-28 20:07:56
● 2026-04-12 07:19:30
○A50.63.202.602015-06-23 → 2015-06-23 · 4 obs
○ 2008-03-07 18:32:34
● 2015-06-23 11:59:56
○ 2015-11-06 20:56:22
○ 2026-04-12 07:19:30
○A68.178.232.1002008-03-07 → 2008-03-07 · 3 obs
● 2008-03-07 18:32:34
○ 2015-06-23 11:59:56
○ 2026-04-12 07:19:30

🔍 DNS Trace

Analysis

Mail Server Role

For course-db.com, the mail server is course-db.com.

IP Addresses

course-db.com points to a single IP number: 162.43.94.65.

other host names for instance ns.orchidcc.com, www.yamagata-melco.co.jp, best-ryoushoku.jp, outlet-rera.com and news123.work share IP numbers with course-db.com.

Name Servers

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

course-db.com at least partially shares name servers with other domains, for instance uranai365.jp, visa110.com, ike-navi.com, boeiraportugalinabottle.com and okotama.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

One mail server handles course-db.com.

Host name course-db.com points to IP address 162.43.94.65.