21lectures.com - robtex.com

21lectures.com

DNSSEC🔒 Signed (DS record present)
A63.250.43.5🇺🇸 NAMCHEAP-PH
PTRingress-comporellon.ewp.live
A63.250.43.6🇺🇸 NAMCHEAP-PH
NSdns1.registrar-servers.com ⭐
A2610:a1:1024::200🇺🇸 MAINT-ID-12008
PTRdns1.namecheaphosting.com
PTRdns1.registrar-servers.com
A156.154.132.200🇺🇸 MAINT-ID-12008
PTRdns1.namecheaphosting.com
PTRdns1.registrar-servers.com
NSdns2.registrar-servers.com
A2610:a1:1025::200🇺🇸 MAINT-ID-12008
PTRdns2.namecheaphosting.com
PTRdns2.registrar-servers.com
A156.154.133.200🇺🇸 MAINT-ID-12008
PTRdns2.namecheaphosting.com
PTRdns2.registrar-servers.com
MXmx1.privateemail.com ⭐
A162.255.118.7🇺🇸 NAMCHEAP-PH
PTRmx1.privateemail.com
MXmx2.privateemail.com ⭐
A162.255.118.8🇺🇸 NAMCHEAP-PH
PTRmx2.privateemail.com
TXTv=spf1 include:spf.privateemail.com ~all
SOAdns1.registrar-servers.comhostmaster@registrar-servers.com serial=1771816882

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

Same first word

21lectures.com

DNS History

12 records (6 active, 6 former)

20192020202120222023202420252026NSdns1.registrar-servers.comdns2.registrar-servers.comMXmx1.privateemail.commx2.privateemail.comeforward1.registrar-servers.comeforward2.registrar-servers.comeforward3.registrar-servers.comeforward4.registrar-servers.comeforward5.registrar-servers.comA63.250.43.563.250.43.6192.64.119.47
●NSdns1.registrar-servers.com2018-05-17 → 2026-02-24 · 2 obs
● 2018-05-17 13:26:48
● 2026-02-24 12:04:10
●NSdns2.registrar-servers.com2018-05-17 → 2026-02-24 · 2 obs
● 2018-05-17 13:26:48
● 2026-02-24 12:04:10
○MXeforward1.registrar-servers.com2018-05-17 → 2018-05-17 · 3 obs
● 2018-05-17 13:26:48
○ 2026-02-15 04:15:36
○ 2026-02-24 12:04:10
○MXeforward2.registrar-servers.com2018-05-17 → 2018-05-17 · 3 obs
● 2018-05-17 13:26:48
○ 2026-02-15 04:15:36
○ 2026-02-24 12:04:10
○MXeforward3.registrar-servers.com2018-05-17 → 2018-05-17 · 3 obs
● 2018-05-17 13:26:48
○ 2026-02-15 04:15:36
○ 2026-02-24 12:04:10
○MXeforward4.registrar-servers.com2018-05-17 → 2018-05-17 · 3 obs
● 2018-05-17 13:26:48
○ 2026-02-15 04:15:36
○ 2026-02-24 12:04:10
○MXeforward5.registrar-servers.com2018-05-17 → 2018-05-17 · 3 obs
● 2018-05-17 13:26:48
○ 2026-02-15 04:15:36
○ 2026-02-24 12:04:10
●MXmx1.privateemail.com2026-02-15 → 2026-02-24 · 3 obs
○ 2018-05-17 13:26:48
● 2026-02-15 04:15:36
● 2026-02-24 12:04:10
●MXmx2.privateemail.com2026-02-15 → 2026-02-24 · 3 obs
○ 2018-05-17 13:26:48
● 2026-02-15 04:15:36
● 2026-02-24 12:04:10
○A192.64.119.472018-05-17 → 2018-05-17 · 3 obs
● 2018-05-17 13:26:48
○ 2026-02-15 04:15:36
○ 2026-02-24 12:04:10
●A63.250.43.52026-02-15 → 2026-02-24 · 3 obs
○ 2018-05-17 13:26:48
● 2026-02-15 04:15:36
● 2026-02-24 12:04:10
●A63.250.43.62026-02-15 → 2026-02-24 · 3 obs
○ 2018-05-17 13:26:48
● 2026-02-15 04:15:36
● 2026-02-24 12:04:10

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
comj.gtld-servers.net, i.gtld-servers.net, h.gtld-servers.net, m.gtld-servers.net...-
21lectures.comdns1.registrar-servers.com, dns2.registrar-servers.com4 records

✅ Authoritative Response

Server: 156.154.133.200

NS records: dns1.registrar-servers.com, dns2.registrar-servers.com

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 147ms | Queries: -

📄 Records

TypeCountSample Data
A263.250.43.6, 63.250.43.5
NS2dns1.registrar-servers.com, dns2.registrar-servers.com
MX2mx1.privateemail.com (pri: 10), mx2.privateemail.com (pri: 10)
TXT1v=spf1 include:spf.privateemail.com ~all
SOA1dns1.registrar-servers.com hostmaster.re

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (dns1.registrar-servers.com, dns1.registrar-servers.com, dns2.registrar-servers.com...)

AI analysis

21lectures.com points to two IP numbers: 63.250.43.5 and 63.250.43.6.

Other host names such as yosoyminda.com, addcox-b43114.ingress-comporellon.ewp.live, gluttens-f51962.ingress-comporellon.ewp.live, 1flix.com and sgcontrol-b85204.ingress-comporellon.ewp.live share IP numbers with 21lectures.com.

21lectures.com is delegated to two name servers: dns1.registrar-servers.com and dns2.registrar-servers.com.

21lectures.com uses the same name server setup as other domains, including belamira.com, pagres.io, gv421.com, change-properties.com and zaidap.com.

At least part of the name servers for 21lectures.com are shared with other domains, for instance tokenfs.net, calcarto.com, socorecords.com, raisethefloorexposed.org and codepalooza.com.

These name servers are often used together with dns3.registrar-servers.com, dns4.registrar-servers.com and dns5.registrar-servers.com.

Host names with two IP numbers:

dns1.registrar-servers.com points to 2610:a1:1024::200 and 156.154.132.200.

dns2.registrar-servers.com points to 2610:a1:1025::200 and 156.154.133.200.

21lectures.com is handled by two mail servers: mx1.privateemail.com and mx2.privateemail.com.

21lectures.com uses the same mail server setup as other domains, for instance efficiency.no, the4thprinciple.com, afternox.com, eventuity.com and arod.org.

21lectures.com shares at least some mail servers with other domains, for example cococalendar.com, reine.co, realmcms.com, proxyshard.com and vision-mro.com.

Hostnames with a single IP

mx1.privateemail.com resolves to: 162.255.118.7.

mx2.privateemail.com resolves to: 162.255.118.8.