class.co.jp - robtex.com

class.co.jp

DNSSEC⚠️ Not signed
A219.94.211.33🇯🇵 SAKURA-C219.94.128.0/17 (3/OSAKA) SAKURA Internet // WEST JAPAN BACKBONE 1-8-15 Kyutaro-cho, Chuo Osaka 541-0056, Japan
PTR33.211.94.219.static.www249b.sakura.ne.jp
NSns000.d-53.net ⭐
NSdns-b.iij.ad.jp ⚠️ Not in zone NS records
A2001:240:bb81::28:51🇯🇵 IIJ-AS2001:240::/32 IIJ IPv6 BLOCK ( AS2497 )
PTRs020.d-53.biz
A202.32.219.51🇯🇵 IIJ-AS202.32.0.0/16 IIJ IPv4 BLOCK ( AS2497 )
PTRs020.d-53.biz
NSdns-c.iij.ad.jp ⚠️ Not in zone NS records
A2001:240:bb81::29:111🇯🇵 IIJ-AS2001:240::/32 IIJ IPv6 BLOCK ( AS2497 )
PTRs020.d-53.net
A210.138.20.111🇯🇵 IIJ-AS210.138.0.0/16 IIJ IPv4 BLOCK ( AS2497 )
PTRs020.d-53.net
NSns020-gj3j4kqcavlt1gd0.g.d-53.info ⚠️ Not in parent delegation
A2001:240:bb81::28:51🇯🇵 IIJ-AS2001:240::/32 IIJ IPv6 BLOCK ( AS2497 )
PTRs020.d-53.biz
A202.32.219.51🇯🇵 IIJ-AS202.32.0.0/16 IIJ IPv4 BLOCK ( AS2497 )
PTRs020.d-53.biz
NSns020-gj3j4kqcavlt1gd0.g.d-53.jp ⚠️ Not in parent delegation
A2001:240:bb81::29:1111🇯🇵 IIJ-AS2001:240::/32 IIJ IPv6 BLOCK ( AS2497 )
PTRs020.d-53.org
A203.180.146.111🇯🇵 IIJ-AS203.180.0.0/16 IIJ IPv4 BLOCK ( AS2497 )
PTRs020.d-53.org
NSns020-gj3j4kqcavlt1gd0.g.d-53.net ⚠️ Not in parent delegation
A2001:240:bb81::29:111🇯🇵 IIJ-AS2001:240::/32 IIJ IPv6 BLOCK ( AS2497 )
PTRs020.d-53.net
A210.138.20.111🇯🇵 IIJ-AS210.138.0.0/16 IIJ IPv4 BLOCK ( AS2497 )
PTRs020.d-53.net
MXmx.securemx.jp ⭐
A210.130.202.92🇯🇵 IIJ-AS210.130.0.0/16 IIJ IPv4 BLOCK ( AS2497 )
PTRmx180b.securemx.jp
A210.130.202.93🇯🇵 IIJ-AS210.130.0.0/16 IIJ IPv4 BLOCK ( AS2497 )
PTRmx114b.securemx.jp
A210.130.202.96🇯🇵 IIJ-AS210.130.0.0/16 IIJ IPv4 BLOCK ( AS2497 )
PTRmx114a.securemx.jp
A210.130.202.99🇯🇵 IIJ-AS210.130.0.0/16 IIJ IPv4 BLOCK ( AS2497 )
PTRmx180a.securemx.jp
TXTv=spf1 include:spf.securemx.jp include:spf.protection.outlook.com include:spf...
SOAns000.d-53.netdns-managers@iij.ad.jp serial=336

co.jp

DNSSEC⚠️ Not signed
TXTco.jp.
WOT: SAFE (58/100)

Subdomains

www.class.co.jp

Same first word

class.es
class.hr
class.on.ca
class.community
class.agency
class.cn
class.rocks
class.services
class.com.br
class.la
class.ca
class.solutions
class.com.pe
class.lk
class.edu.vn
class.email
class.pe
class.bg
class.ai
class.business
class.ai.in
class.se
class.ly
class.su
class.rs
class.de
class.co
class.am
class.it
class.works
class.systems
class.technology
class.network
class.com.py
class.info
class.do
class.tax
class.world
class.expert
class.co.at
class.msk.ru
class.so
class.al
class.eu
class.st
class.id
class.biz
class.com.tr
class.gr
class.org
class.us
class.com
class.bet
class.ps
class.edu.pl
class.com.mx
class.dk
class.builders
class.capital
class.watch
class.srl
class.land
class.com.cn
class.lv
class.cash
class.management
class.wiki
class.ch
class.com.tw
class.guide
class.kr
class.cc
class.mba
class.tech
class.digital
class.sk
class.run
class.today
class.immo
class.me
class.im
class.cl
class.ma
class.adobeaemcloud.com
class.com.au
class.nl
class.io
class.fr
class.tel
class.net
class.hu
class.ro
class.net.nz
class.co.jp
class.zone
class.no

Similar names

scsla.org
clsas.com
ssacl.com
slcsa.co.za
slcas.on.ca
cassl.org
ascls.org
lsasc.org
slacs.de
clssa.info
lscas.com
scals.de
clssa.org
scsla.com
scals.co.jp
sclsa.com
sacsl.es
ascsl.com
acssl.campaign.gov.uk
aslcs.com
lscsa.com
sslca.io
lcsas.us
lcssa.com
lssac.com
slacs.ca
lsasc.com
cssla.com
slsca.com
sslca.com
ascsl.net
sscal.com
aclss.com
ssalc.org
saslc.com
casls.com
acssl.com
salsc.com
alscs.com
calss.net.cn
lscsa.de
lacss.org
slacs.net

DNS History

9 records (8 active, 1 former)

20162017201820192020202120222023202420252026NSdns-b.iij.ad.jpdns-c.iij.ad.jpns000.d-53.netns020-gj3j4kqcavlt1gd0.g.d-53.infons020-gj3j4kqcavlt1gd0.g.d-53.jpns020-gj3j4kqcavlt1gd0.g.d-53.netMXmx.securemx.jpmx.po.2iij.netA219.94.211.33
●NSdns-b.iij.ad.jp2015-06-22 → 2026-04-29 · 2 obs
● 2015-06-22 05:09:02
● 2026-04-29 15:52:58
●NSdns-c.iij.ad.jp2015-06-22 → 2026-04-29 · 2 obs
● 2015-06-22 05:09:02
● 2026-04-29 15:52:58
●NSns000.d-53.net2026-04-27 → 2026-04-29 · 3 obs
○ 2015-06-22 05:09:02
● 2026-04-27 08:37:56
● 2026-04-29 15:52:58
●NSns020-gj3j4kqcavlt1gd0.g.d-53.info2026-04-27 → 2026-04-29 · 3 obs
○ 2015-06-22 05:09:02
● 2026-04-27 08:37:56
● 2026-04-29 15:52:58
●NSns020-gj3j4kqcavlt1gd0.g.d-53.jp2026-04-27 → 2026-04-29 · 3 obs
○ 2015-06-22 05:09:02
● 2026-04-27 08:37:56
● 2026-04-29 15:52:58
●NSns020-gj3j4kqcavlt1gd0.g.d-53.net2026-04-27 → 2026-04-29 · 3 obs
○ 2015-06-22 05:09:02
● 2026-04-27 08:37:56
● 2026-04-29 15:52:58
○MXmx.po.2iij.net2015-06-22 → 2017-02-18 · 4 obs
● 2015-06-22 05:09:02
● 2017-02-18 23:31:22
○ 2026-04-27 08:37:56
○ 2026-04-29 15:52:58
●MXmx.securemx.jp2026-04-27 → 2026-04-29 · 3 obs
○ 2017-02-18 23:31:22
● 2026-04-27 08:37:56
● 2026-04-29 15:52:58
●A219.94.211.332026-04-27 → 2026-04-29 · 2 obs
● 2026-04-27 08:37:56
● 2026-04-29 15:52:58

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
jpe.dns.jp, g.dns.jp, c.dns.jp, a.dns.jp...-
class.co.jpdns-b.iij.ad.jp, dns-c.iij.ad.jp-

✅ Authoritative Response

Server:202.32.219.51

NS records: dns-b.iij.ad.jp, dns-c.iij.ad.jp

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for class.co.jp (unsigned zone)

⏱️ Timing

Total: 1594ms | Queries: -

📄 Records

TypeCountSample Data
A1219.94.211.33
NS3ns020-gj3j4kqcavlt1gd0.g.d-53.net, ns020-gj3j4kqcavlt1gd0.g.d-53.info...
MX1mx.securemx.jp (pri: 0)
TXT1v=spf1 include:spf.securemx.jp include:s
SOA1ns000.d-53.net dns-managers.iij.ad.jp

Analysis

Hierarchy

class.co.jp is the parent of www.class.co.jp.

IP Addresses

class.co.jp points to a single IP number: 219.94.211.33.

Name Servers

class.co.jp is delegated to six name servers: ns000.d-53.net, ns020-gj3j4kqcavlt1gd0.g.d-53.info, dns-b.iij.ad.jp, dns-c.iij.ad.jp, ns020-gj3j4kqcavlt1gd0.g.d-53.jp and ns020-gj3j4kqcavlt1gd0.g.d-53.net.

class.co.jp at least partially shares name servers with other domains, for instance kumamoto-if.or.jp, mts-kk.co.jp, valkyrieconnect.com, 1.149.210.in-addr.arpa and cri-mw.co.jp.

These name servers are commonly used with rev.iij-dns.jp, rev.iij-dns.net, ns01.iij-dns.jp, ns00.iij-dns.net, dns0.iij-swg.jp, dns1.iij-swg.jp and ns020-6g3uohoqaf58ogl2.6.d-53.info.

Host names with two IPs

ns020-gj3j4kqcavlt1gd0.g.d-53.info points to 2001:240:bb81::28:51 and 202.32.219.51

dns-b.iij.ad.jp points to 2001:240:bb81::28:51 and 202.32.219.51

dns-c.iij.ad.jp points to 2001:240:bb81::29:111 and 210.138.20.111

ns020-gj3j4kqcavlt1gd0.g.d-53.jp points to 2001:240:bb81::29:1111 and 203.180.146.111

ns020-gj3j4kqcavlt1gd0.g.d-53.net points to 2001:240:bb81::29:111 and 210.138.20.111

Names pointing to 2001:240:bb81::28:51: ns020-gj3j4kqcavlt1gd0.g.d-53.info and dns-b.iij.ad.jp

Names pointing to 202.32.219.51: ns020-gj3j4kqcavlt1gd0.g.d-53.info and dns-b.iij.ad.jp

Names pointing to 2001:240:bb81::29:111: dns-c.iij.ad.jp and ns020-gj3j4kqcavlt1gd0.g.d-53.net

Names pointing to 210.138.20.111: dns-c.iij.ad.jp and ns020-gj3j4kqcavlt1gd0.g.d-53.net

Patterns: 2001:240:bb81::28:51 and 202.32.219.51 are shared by ns020-gj3j4kqcavlt1gd0.g.d-53.info and dns-b.iij.ad.jp. 2001:240:bb81::29:111 and 210.138.20.111 are shared by dns-c.iij.ad.jp and ns020-gj3j4kqcavlt1gd0.g.d-53.net

Mail Servers

class.co.jp is handled by a single mail server, mx.securemx.jp.

class.co.jp shares the same mail server setup as other domains, for instance toshiba-ttda.com, c-nexco-het.jp, smd-am.co.jp, sig-c.co.jp and tosho.city.kashiwa.lg.jp.

class.co.jp shares mail servers with other domains at least partially, including nippov.co.jp, heri.co.jp, dnp.imgcomm.eu, daisanbank.co.jp and fujimori.co.jp.

these mail servers are commonly used alongside mx6.securemx.jp.

Host name mx.securemx.jp resolves to four IP numbers: 210.130.202.92, 210.130.202.93, 210.130.202.96 and 210.130.202.99.