master-classmate.com - robtex.com

master-classmate.com

DNSSEC⚠️ Not signed
A52.193.121.155🇯🇵 Amazon52.192.0.0/15 EC2 NRT prefix
PTRec2-52-193-121-155.ap-northeast-1.compute.amazonaws.com
NSns11.value-domain.com ⭐ ⚠️ Not in parent delegation
A172.64.52.98🇺🇸 Cloudflare172.64.52.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
A172.64.52.184🇺🇸 Cloudflare172.64.52.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
NSns1.value-domain.com ⚠️ Not in zone NS records
A172.64.52.38🇺🇸 Cloudflare172.64.52.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRip-172-64-52-38.defastlink.net
A172.64.52.161🇺🇸 Cloudflare172.64.52.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRip-172-64-52-161.defastlink.net
NSns12.value-domain.com ⚠️ Not in zone NS records
A172.64.53.86🇺🇸 Cloudflare172.64.53.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
A172.64.53.188🇺🇸 Cloudflare172.64.53.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
NSns13.value-domain.com ⚠️ Not in zone NS records
A172.64.52.98🇺🇸 Cloudflare172.64.52.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
A172.64.52.184🇺🇸 Cloudflare172.64.52.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
NSns2.value-domain.com ⚠️ Not in parent delegation
A172.64.53.3🇺🇸 Cloudflare172.64.53.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRip-172-64-53-3.defastlink.net
A172.64.53.115🇺🇸 Cloudflare172.64.53.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRip-172-64-53-115.defastlink.net
MXmail.master-classmate.com ⭐
A160.251.151.207🇯🇵 GMOOSK-NET160.251.151.0/24 GMO Internet,Inc Cerulean Tower, 11F Sakuragaokacho-26-1 Shibuya-ku, Tokyo 150-8512, Japan
PTRs501.xrea.com
TXTv=spf1 +ip4:160.251.151.207 +ip4:52.193.121.155 include:spf.bserver.jp ~all
SOAns1.value-domain.comhostmaster@master-classmate.com 2020-08-26 #23

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=1771291435

DNS History

7 records (7 active, 0 former)

2020202120222023202420252026NSns1.value-domain.comns11.value-domain.comns12.value-domain.comns13.value-domain.comns2.value-domain.comMXmail.master-classmate.comA52.193.121.155
●NSns1.value-domain.com2026-02-28 → 2026-02-28 · 2 obs
○ 2019-12-16 05:18:56
● 2026-02-28 21:06:42
●NSns11.value-domain.com2019-12-16 → 2026-02-28 · 2 obs
● 2019-12-16 05:18:56
● 2026-02-28 21:06:42
●NSns12.value-domain.com2019-12-16 → 2026-02-28 · 2 obs
● 2019-12-16 05:18:56
● 2026-02-28 21:06:42
●NSns13.value-domain.com2019-12-16 → 2026-02-28 · 2 obs
● 2019-12-16 05:18:56
● 2026-02-28 21:06:42
●NSns2.value-domain.com2026-02-28 → 2026-02-28 · 2 obs
○ 2019-12-16 05:18:56
● 2026-02-28 21:06:42
●MXmail.master-classmate.com2019-12-16 → 2026-02-28 · 2 obs
● 2019-12-16 05:18:56
● 2026-02-28 21:06:42
●A52.193.121.1552019-12-16 → 2026-02-28 · 2 obs
● 2019-12-16 05:18:56
● 2026-02-28 21:06:42

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coml.gtld-servers.net, f.gtld-servers.net, d.gtld-servers.net, c.gtld-servers.net...-
master-classmate.comns11.value-domain.com, ns12.value-domain.com, ns13.value-domain.com3 records

✅ Authoritative Response

Server: 172.64.53.86

NS records: ns11.value-domain.com, ns12.value-domain.com, ns13.value-domain.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for master-classmate.com (unsigned zone)

⏱️ Timing

Total: 516ms | Queries: -

📄 Records

TypeCountSample Data
A152.193.121.155
NS2ns2.value-domain.com, ns1.value-domain.com
MX1mail.master-classmate.com (pri: 10)
TXT1v=spf1 +ip4:160.251.151.207 +ip4:52.193.
SOA1ns1.value-domain.com hostmaster.master-c

📌 Glue Records Collected

Total: 3

Out-of-bailiwick: 3 (ns11.value-domain.com, ns12.value-domain.com, ns13.value-domain.com)

Analysis

IP Addresses

master-classmate.com points to IP number: 52.193.121.155.

Other host names such as k-classmate.jp, love-essence.com, a-cloud.co.jp, k-homeroom.jp and mail.i-classmate.jp share IPs with master-classmate.com.

Name Servers

master-classmate.com is delegated to five name servers: ns11.value-domain.com, ns12.value-domain.com, ns13.value-domain.com, ns1.value-domain.com and ns2.value-domain.com.

master-classmate.com at least partially shares name servers with other domains, for instance khonyaku.com, sogo-s.com, trialbox.net, root-web.net and oto-labo.com.

These name servers are commonly used together with ns3.value-domain.com, ns4.value-domain.com and ns5.value-domain.com.

Two IP numbers per host name:

Host ns11.value-domain.com points to 172.64.52.98 and 172.64.52.184.

Host ns12.value-domain.com points to 172.64.53.86 and 172.64.53.188.

Host ns13.value-domain.com points to 172.64.52.98 and 172.64.52.184.

Host ns1.value-domain.com points to 172.64.52.38 and 172.64.52.161.

Host ns2.value-domain.com points to 172.64.53.3 and 172.64.53.115.

Hosts pointing to 172.64.52.98: ns11.value-domain.com and ns13.value-domain.com.

Hosts pointing to 172.64.52.184: ns11.value-domain.com and ns13.value-domain.com.

Mail Servers

master-classmate.com is handled by a single mail server, mail.master-classmate.com.

mail.master-classmate.com points to a single IP: 160.251.151.207.