c21.co.jp - robtex.com

c21.co.jp

DNSSEC⚠️ Not signed
A153.125.228.7🇯🇵 SAKURA-B153.125.224.0/20 (TOKYO) SAKURA Internet // EAST JAPAN BACKBONE Sakaisuji Honmachi Bldg. 9F 1-8-14 Minami-Honmachi, Chuo-ku Osaka 541-0054, Japan
PTRf33.macly.jp
NSmaster.dns.ne.jp ⭐
A210.224.172.18🇯🇵 SAKURA-C210.224.160.0/19 (1/OSAKA) SAKURA Internet // WEST JAPAN BACKBONE 1-8-15 Kyutaro-cho, Chuo Osaka 541-0056, Japan
PTRmaster.dns.ne.jp
NSns1.dns.ne.jp
A61.211.236.1🇯🇵 SAKURA-B61.211.236.0/24 (4/TOKYO) SAKURA Internet // EAST JAPAN BACKBONE 1-8-15 Kyutaro-cho, Chuo Osaka 541-0056, Japan
PTRns1.dns.ne.jp
NSns2.dns.ne.jp
A133.167.21.1🇯🇵 SAKURA-C133.167.21.0/24 (OSAKA) SAKURA Internet // WEST JAPAN BACKBONE Grand Front Osaka Tower A 35F, 4-20 Ofukacho, Kita-ku, Osaka, Osaka 530-0011, Japan
MXmail.c21.co.jp ⭐
A163.43.197.179🇯🇵 SAKURA-B163.43.0.0/16 (TOKYO) SAKURA Internet // EAST JAPAN BACKBONE Sakaisuji Honmachi Bldg. 9F 1-8-14 Minami-Honmachi, Chuo-ku Osaka 541-0054, Japan
PTRwww50139.sakura.ne.jp
TXTv=spf1 include:spf.macly.jp include:spfsakura.macly.jp include:spfblue.macly....
SOAmaster.dns.ne.jptech@sakura.ad.jp 2025-12-17 #4

co.jp

DNSSEC⚠️ Not signed
TXTco.jp.
WOT: SAFE (61/100)
WOT: SAFE (58/100)

Previously MX for

c21.co.jp

Subdomains

www.c21.co.jp
mail.c21.co.jp

Same first word

c21.hr
c21.com.br
c21.pe
c21.com.cy
c21.com.vn
c21.com.cn
c21.to
c21.site
c21.gy
c21.mn
c21.pl
c21.tw
c21.me
c21.be
c21.properties
c21.com.pe
c21.azureedge.net
c21.com
c21.com.sg
c21.cz
c21.bz
c21.net
c21.nyc
c21.guru
c21.vn
c21.com.bo
c21.info
c21.in
c21.tv
c21.ru
c21.biz
c21.one
c21.it
c21.com.hk
c21.asia
c21.si
c21.at
c21.ir
c21.online
c21.mx
c21.cn
c21.pt
c21.ca
c21.gr
c21.sk
c21.eu
c21.hk
c21.fr
c21.us
c21.dk
c21.nl
c21.xyz
c21.net.cn
c21.com.tr
c21.co.jp
c21.ro
c21.ae
c21.tech
c21.homes
c21.al
c21.co

Similar names

c12.co.il
12c.cz
c12.cz
21c.ca
21c.online
21c.pl
1c2.eu
c12.pl
21c.de
c12.cn
12c.no
21c.email
21c.co.uk
1c2.mobi
1c2.de
2c1.de
c12.com.au
c12.me
21c.co.in
12c.com
12c.me
c12.it
21c.or.kr
1c2.info
21c.net
21c.nl
c12.in
21c.xin
c12.fr
c12.dk
2c1.fr
21c.cn
21c.me
21c.ru
1c2.me
21c.co.jp
1c2.com.cn
c12.com
c12.kr
c12.nl
21c.it
1c2.net
12c.in
12c.nl
12c.co.uk
12c.eu
c12.com.br
2c1.com
c12.tv
2c1.net
c12.ca
21c.com
1c2.fr
12c.org
21c.org
c12.es
12c.cn
12c.io

DNS History

11 records (5 active, 6 former)

200920112013201520172019202120232025NSmaster.dns.ne.jpns1.dns.ne.jpns2.dns.ne.jpm58.macly.jpns3.sphere.ad.jpns4.sphere.ad.jpMXmail.c21.co.jpc21.co.jpA153.125.228.7210.150.69.168219.94.183.201
○NSm58.macly.jp2015-08-06 → 2017-04-05 · 5 obs
○ 2008-06-01 07:24:26
● 2015-08-06 17:25:26
● 2017-04-05 10:37:24
○ 2026-06-06 19:41:28
○ 2026-07-14 08:17:20
●NSmaster.dns.ne.jp2026-06-06 → 2026-07-14 · 3 obs
○ 2017-04-05 10:37:24
● 2026-06-06 19:41:28
● 2026-07-14 08:17:20
●NSns1.dns.ne.jp2026-06-06 → 2026-07-14 · 3 obs
○ 2017-04-05 10:37:24
● 2026-06-06 19:41:28
● 2026-07-14 08:17:20
●NSns2.dns.ne.jp2026-06-06 → 2026-07-14 · 3 obs
○ 2017-04-05 10:37:24
● 2026-06-06 19:41:28
● 2026-07-14 08:17:20
○NSns3.sphere.ad.jp2008-06-01 → 2008-06-01 · 3 obs
● 2008-06-01 07:24:26
○ 2015-08-06 17:25:26
○ 2026-07-14 08:17:20
○NSns4.sphere.ad.jp2008-06-01 → 2008-06-01 · 3 obs
● 2008-06-01 07:24:26
○ 2015-08-06 17:25:26
○ 2026-07-14 08:17:20
○MXc21.co.jp2008-06-01 → 2008-06-01 · 3 obs
● 2008-06-01 07:24:26
○ 2015-08-06 17:25:26
○ 2026-07-14 08:17:20
●MXmail.c21.co.jp2015-08-06 → 2026-07-14 · 3 obs
○ 2008-06-01 07:24:26
● 2015-08-06 17:25:26
● 2026-07-14 08:17:20
●A153.125.228.72026-06-06 → 2026-07-14 · 3 obs
○ 2017-04-05 10:37:24
● 2026-06-06 19:41:28
● 2026-07-14 08:17:20
○A210.150.69.1682008-06-01 → 2008-06-01 · 3 obs
● 2008-06-01 07:24:26
○ 2015-08-06 17:25:26
○ 2026-07-14 08:17:20
○A219.94.183.2012015-08-06 → 2017-04-05 · 5 obs
○ 2008-06-01 07:24:26
● 2015-08-06 17:25:26
● 2017-04-05 10:37:24
○ 2026-06-06 19:41:28
○ 2026-07-14 08:17:20

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
jpe.dns.jp, g.dns.jp, c.dns.jp, a.dns.jp...-
c21.co.jpns1.dns.ne.jp, ns2.dns.ne.jp2 records

✅ Authoritative Response

Server:61.211.236.1

NS records: ns1.dns.ne.jp, ns2.dns.ne.jp

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for c21.co.jp (unsigned zone)

⏱️ Timing

Total: 1160ms | Queries: -

📄 Records

TypeCountSample Data
A1153.125.228.7
NS2ns1.dns.ne.jp, ns2.dns.ne.jp
MX1mail.c21.co.jp (pri: 10)
TXT1v=spf1 include:spf.macly.jp include:spfs
SOA1master.dns.ne.jp tech.sakura.ad.jp

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns2.dns.ne.jp, ns1.dns.ne.jp)

Analysis

Hierarchy

www.c21.co.jp and mail.c21.co.jp are both subdomains of c21.co.jp.

IP Addresses

c21.co.jp resolves to one IP address: 153.125.228.7.

houseplanning.net, riseup-net.co.jp, country-life.co.jp and two other host names share IP numbers with c21.co.jp.

Name Servers

c21.co.jp has three name servers — master.dns.ne.jp, ns1.dns.ne.jp and ns2.dns.ne.jp.

At least some of c21.co.jp's name servers are shared with other domains, for example inbe.co.jp, vitalgym24.jp, rkoubou.sakura.ne.jp and two more.

These name servers tend to be used in conjunction with the name servers dns.sakura.ad.jp.

Each of the three hostnames points to exactly one IP address: master.dns.ne.jp points to 210.224.172.18, ns1.dns.ne.jp points to 61.211.236.1 and ns2.dns.ne.jp points to 133.167.21.1.

Mail Servers

Mail for c21.co.jp is handled by a single mail server, mail.c21.co.jp.

The mail server configuration of c21.co.jp is identical to that of other domains — mail.c21.co.jp being one example.

mail.c21.co.jp points to one IP number — 163.43.197.179.