theoryknowledge.com - robtex.com

theoryknowledge.com

DNSSEC⚠️ Not signed
A183.181.81.21🇯🇵 XSERVER-AS183.181.80.0/22 XSERVER Inc.
PTRsv10340.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
MXtheoryknowledge.com
A183.181.81.21🇯🇵 XSERVER-AS183.181.80.0/22 XSERVER Inc.
PTRsv10340.xserver.jp
TXTgoogle-site-verification=RWeBls9vzc3SyfBib6xRbnFOH90TMnfjYKHBV6kszyM
TXTv=spf1 +a:sv10340.xserver.jp +a:theoryknowledge.com +mx include:spf.sender.xs...
SOAns1.xserver.jproot@xserver.jp serial=0

com

MX for

Same first word

DNS History

7 records (7 active, 0 former)

NSns1.xserver.jpns2.xserver.jpns3.xserver.jpns4.xserver.jpns5.xserver.jpMXtheoryknowledge.comA183.181.81.21
NSns1.xserver.jp2026-03-08 → 2026-08-07 · 2 obs
● 2026-03-08 10:37:20
● 2026-08-07 11:17:56
NSns2.xserver.jp2026-03-08 → 2026-08-07 · 2 obs
● 2026-03-08 10:37:20
● 2026-08-07 11:17:56
NSns3.xserver.jp2026-03-08 → 2026-08-07 · 2 obs
● 2026-03-08 10:37:20
● 2026-08-07 11:17:56
NSns4.xserver.jp2026-03-08 → 2026-08-07 · 2 obs
● 2026-03-08 10:37:20
● 2026-08-07 11:17:56
NSns5.xserver.jp2026-03-08 → 2026-08-07 · 2 obs
● 2026-03-08 10:37:20
● 2026-08-07 11:17:56
MXtheoryknowledge.com2026-03-08 → 2026-08-07 · 2 obs
● 2026-03-08 10:37:20
● 2026-08-07 11:17:56
A183.181.81.212026-03-08 → 2026-08-07 · 2 obs
● 2026-03-08 10:37:20
● 2026-08-07 11:17:56

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coma.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...-
theoryknowledge.comns1.xserver.jp, ns2.xserver.jp, ns3.xserver.jp, ns4.xserver.jp...-

✅ Authoritative Response

Server:157.112.182.220

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 theoryknowledge.com (unsigned zone)

⏱️ Timing

Total: 1320ms | Queries: -

📄 Records

TypeCountSample Data
A1183.181.81.21
NS5ns3.xserver.jp, ns4.xserver.jp...
MX1theoryknowledge.com (pri: 0)
TXT2google-site-verification=RWeBls9vzc3SyfB, v=spf1 +a:sv10340.xserver.jp +a:theorykn
SOA1ns1.xserver.jp root.xserver.jp

Analysis

Mail Server Role

The MX record for theoryknowledge.com points back to theoryknowledge.com — it is its own mail server.

IP Addresses

theoryknowledge.com directs to one IP number, which is 183.181.81.21.

Among the host names that share IP numbers with theoryknowledge.com are agk.jp, gaprise.com, zuttoride.co.jp and two others.

Name Servers

The authoritative name servers for theoryknowledge.com are ns1.xserver.jp, ns2.xserver.jp, ns3.xserver.jp and two others.

The name servers of theoryknowledge.com overlap at least partially with those of other domains — among them tweedees.tokyo, fs-create.net, youtuber2.com and two more.

These name servers commonly appear alongside the name servers ns4.xserver.jp and ns5.xserver.jp.

Hosts with three IP address records:

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.

Hosts that resolve to one IP address:

ns2.xserver.jp points to 35.72.43.26.

ns3.xserver.jp points to 202.226.36.247.

Mail Servers

The MX record for theoryknowledge.com points to a single mail server: theoryknowledge.com.

theoryknowledge.com resolves to a single IP number: 183.181.81.21.