coursefirst.com - robtex.com

coursefirst.com

DNSSEC⚠️ Not signed
A2600:1f18:4ae:c605:f094:2a0a:4985:526e🇺🇸 Amazon2600:1f18::/35 AMAZON EC2 IAD prefix
A2600:1f18:4ae:c606:def:b9d9:eb9e:7766🇺🇸 Amazon2600:1f18::/35 AMAZON EC2 IAD prefix
A52.201.53.166🇺🇸 Amazon52.200.0.0/13 EC2 IAD prefix
A98.82.42.139🇺🇸 Amazon98.80.0.0/13 EC2 IAD Prefix
NSns1.namebrightdns.com ⭐
A2600:1f18:683a:ae1a:aa86:dc69:2f3:5dbe🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A2600:1f18:683a:ae1b:6b86:f70d:6af7:3a27🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A52.91.47.137🇺🇸 Amazon52.90.0.0/15 EC2 IAD prefix
PTRec2-52-91-47-137.compute-1.amazonaws.com
A54.92.199.119🇺🇸 Amazon54.92.128.0/17 EC2 IAD prefix
PTRec2-54-92-199-119.compute-1.amazonaws.com
NSnsg1.namebrightdns.com
A2600:1f18:683a:ae1a:894e:779f:a1ca:3cf5🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A2600:1f18:683a:ae1a:e5a9:8ee2:a408:496a🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A2600:1f18:683a:ae1b:dd1:87a9:86ad:6b5a🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A2600:1f18:683a:ae1b:9806:d504:f0e4:26c🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A2600:1f18:683a:ae1b:a00e:60bf:4fb5:f5b🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A2600:1f18:683a:ae1b:b2d2:f9bf:c31b:7e61🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A3.84.123.160🇺🇸 Amazon3.80.0.0/12 EC2 IAD prefix
PTRec2-3-84-123-160.compute-1.amazonaws.com
A3.89.209.21🇺🇸 Amazon3.80.0.0/12 EC2 IAD prefix
PTRec2-3-89-209-21.compute-1.amazonaws.com
A13.220.228.105🇺🇸 Amazon13.216.0.0/13 EC2 IAD prefix
PTRec2-13-220-228-105.compute-1.amazonaws.com
A44.220.149.224🇺🇸 Amazon44.192.0.0/11 EC2 IAD prefix
PTRec2-44-220-149-224.compute-1.amazonaws.com
A54.90.222.89🇺🇸 Amazon54.90.0.0/15 EC2 IAD prefix
PTRec2-54-90-222-89.compute-1.amazonaws.com
A98.81.135.11🇺🇸 Amazon98.80.0.0/13 EC2 IAD Prefix
PTRec2-98-81-135-11.compute-1.amazonaws.com
NSnsg2.namebrightdns.com
A2600:1f18:683a:ae1a:2220:bd04:2603:2fe6🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A2600:1f18:683a:ae1a:810d:d2b:3efc:2833🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A2600:1f18:683a:ae1a:e1f7:fcf3:dce8:5758🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A2600:1f18:683a:ae1a:e842:8110:107c:b494🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A2600:1f18:683a:ae1b:130f:6e59:4e36:8c1e🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A2600:1f18:683a:ae1b:4ce9:d414:4fb6:5821🇺🇸 Amazon2600:1f18:6000::/35 AMAZON EC2 IAD prefix
A3.85.217.230🇺🇸 Amazon3.80.0.0/12 EC2 IAD prefix
PTRec2-3-85-217-230.compute-1.amazonaws.com
A13.221.125.168🇺🇸 Amazon13.216.0.0/13 EC2 IAD prefix
PTRec2-13-221-125-168.compute-1.amazonaws.com
A18.209.34.29🇺🇸 Amazon18.208.0.0/13 EC2 IAD prefix
PTRec2-18-209-34-29.compute-1.amazonaws.com
A34.201.103.40🇺🇸 Amazon34.192.0.0/12 EC2 IAD prefix
PTRec2-34-201-103-40.compute-1.amazonaws.com
A34.202.237.97🇺🇸 Amazon34.192.0.0/12 EC2 IAD prefix
PTRec2-34-202-237-97.compute-1.amazonaws.com
A98.93.89.251🇺🇸 Amazon98.88.0.0/13 EC2 IAD prefix
PTRec2-98-93-89-251.compute-1.amazonaws.com
TXTafternic-verification-G9G3tM8T8EwEizzPzjGJWF
TXTv=spf1 -all
SOAns1.namebrightdns.comdns@namebright.com 2026-03-25 #1

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=1774460487

Same first word

coursefirst.com

Similar names

frostcruise.com
stoicsurfer.com
firstsource.com
firstsource.eu
crossfireut.com
sourcefirst.net
firstsource.in
sourcefirst.com
cruisersoft.com
firstsource.la
softcruiser.com
firstcourse.in
firstcourse.net
firstsource.io
firstsource.life
firstcourse.org
firstsource.net
resortficus.com
firstsource.org

DNS History

28 records (7 active, 21 former)

20162017201820192020202120222023202420252026NSns1.namebrightdns.comnsg1.namebrightdns.comnsg2.namebrightdns.comns1.crazydomains.comns1.resolved.net.auns2.crazydomains.comns2.resolved.net.auns43.domaincontrol.comns44.domaincontrol.comMXalt1.aspmx.l.google.comalt2.aspmx.l.google.comalt3.aspmx.l.google.comalt4.aspmx.l.google.comanmail.namebrightmail.comaspmx.l.google.commail.coursefirst.comA2600:1f18:4ae:c605:f094:2a0a:4985:526e2600:1f18:4ae:c606:def:b9d9:eb9e:776652.201.53.16698.82.42.13913.223.25.84166.62.46.210166.62.6.102203.170.80.2502600:1f18:4ae:c605:dd5d:b838:5816:d7fb2600:1f18:4ae:c606:78d4:4260:db4e:aeee43.245.162.20354.243.117.197
○NSns1.crazydomains.com2015-08-17 → 2015-12-01 · 4 obs
● 2015-08-17 15:29:16
● 2015-12-01 04:09:48
○ 2016-03-11 01:26:28
○ 2026-03-25 18:02:24
●NSns1.namebrightdns.com2026-03-24 → 2026-03-25 · 3 obs
○ 2026-03-19 05:28:14
● 2026-03-24 05:35:40
● 2026-03-25 18:02:24
○NSns1.resolved.net.au2019-02-07 → 2019-02-07 · 4 obs
○ 2017-03-13 06:38:58
● 2019-02-07 08:14:18
○ 2026-03-19 05:28:14
○ 2026-03-25 18:02:24
○NSns2.crazydomains.com2015-08-17 → 2015-12-01 · 4 obs
● 2015-08-17 15:29:16
● 2015-12-01 04:09:48
○ 2016-03-11 01:26:28
○ 2026-03-25 18:02:24
○NSns2.resolved.net.au2019-02-07 → 2019-02-07 · 4 obs
○ 2017-03-13 06:38:58
● 2019-02-07 08:14:18
○ 2026-03-19 05:28:14
○ 2026-03-25 18:02:24
○NSns43.domaincontrol.com2016-03-11 → 2017-03-13 · 5 obs
○ 2015-12-01 04:09:48
● 2016-03-11 01:26:28
● 2017-03-13 06:38:58
○ 2019-02-07 08:14:18
○ 2026-03-25 18:02:24
○NSns44.domaincontrol.com2016-03-11 → 2017-03-13 · 5 obs
○ 2015-12-01 04:09:48
● 2016-03-11 01:26:28
● 2017-03-13 06:38:58
○ 2019-02-07 08:14:18
○ 2026-03-25 18:02:24
●NSnsg1.namebrightdns.com2026-03-24 → 2026-03-25 · 3 obs
○ 2026-03-19 05:28:14
● 2026-03-24 05:35:40
● 2026-03-25 18:02:24
●NSnsg2.namebrightdns.com2026-03-24 → 2026-03-25 · 3 obs
○ 2026-03-19 05:28:14
● 2026-03-24 05:35:40
● 2026-03-25 18:02:24
○MXalt1.aspmx.l.google.com2016-06-26 → 2019-02-07 · 5 obs
○ 2016-03-11 01:26:28
● 2016-06-26 03:04:18
● 2019-02-07 08:14:18
○ 2026-03-19 05:28:14
○ 2026-03-25 18:02:24
○MXalt2.aspmx.l.google.com2016-06-26 → 2019-02-07 · 5 obs
○ 2016-03-11 01:26:28
● 2016-06-26 03:04:18
● 2019-02-07 08:14:18
○ 2026-03-19 05:28:14
○ 2026-03-25 18:02:24
○MXalt3.aspmx.l.google.com2016-06-26 → 2019-02-07 · 5 obs
○ 2016-03-11 01:26:28
● 2016-06-26 03:04:18
● 2019-02-07 08:14:18
○ 2026-03-19 05:28:14
○ 2026-03-25 18:02:24
○MXalt4.aspmx.l.google.com2016-06-26 → 2019-02-07 · 5 obs
○ 2016-03-11 01:26:28
● 2016-06-26 03:04:18
● 2019-02-07 08:14:18
○ 2026-03-19 05:28:14
○ 2026-03-25 18:02:24
○MXanmail.namebrightmail.com2026-03-24 → 2026-03-24 · 3 obs
○ 2026-03-19 05:28:14
● 2026-03-24 05:35:40
○ 2026-03-25 18:02:24
○MXaspmx.l.google.com2016-06-26 → 2019-02-07 · 5 obs
○ 2016-03-11 01:26:28
● 2016-06-26 03:04:18
● 2019-02-07 08:14:18
○ 2026-03-19 05:28:14
○ 2026-03-25 18:02:24
○MXmail.coursefirst.com2016-03-11 → 2016-03-11 · 3 obs
● 2016-03-11 01:26:28
○ 2016-06-26 03:04:18
○ 2026-03-25 18:02:24
○A13.223.25.842026-03-24 → 2026-03-24 · 3 obs
○ 2026-03-19 05:28:14
● 2026-03-24 05:35:40
○ 2026-03-25 18:02:24
○A166.62.46.2102016-06-26 → 2017-03-13 · 5 obs
○ 2016-03-11 01:26:28
● 2016-06-26 03:04:18
● 2017-03-13 06:38:58
○ 2019-02-07 08:14:18
○ 2026-03-25 18:02:24
○A166.62.6.1022016-03-11 → 2016-03-11 · 4 obs
○ 2015-12-01 04:09:48
● 2016-03-11 01:26:28
○ 2016-06-26 03:04:18
○ 2026-03-25 18:02:24
○A203.170.80.2502015-08-17 → 2015-12-01 · 4 obs
● 2015-08-17 15:29:16
● 2015-12-01 04:09:48
○ 2016-03-11 01:26:28
○ 2026-03-25 18:02:24
○A2600:1f18:4ae:c605:dd5d:b838:5816:d7fb2026-03-24 → 2026-03-24 · 3 obs
○ 2026-03-19 05:28:14
● 2026-03-24 05:35:40
○ 2026-03-25 18:02:24
●A2600:1f18:4ae:c605:f094:2a0a:4985:526e2026-03-25 → 2026-03-25 · 2 obs
○ 2026-03-24 05:35:40
● 2026-03-25 18:02:24
○A2600:1f18:4ae:c606:78d4:4260:db4e:aeee2026-03-24 → 2026-03-24 · 3 obs
○ 2026-03-19 05:28:14
● 2026-03-24 05:35:40
○ 2026-03-25 18:02:24
●A2600:1f18:4ae:c606:def:b9d9:eb9e:77662026-03-25 → 2026-03-25 · 2 obs
○ 2026-03-24 05:35:40
● 2026-03-25 18:02:24
○A43.245.162.2032019-02-07 → 2019-02-07 · 4 obs
○ 2017-03-13 06:38:58
● 2019-02-07 08:14:18
○ 2026-03-19 05:28:14
○ 2026-03-25 18:02:24
●A52.201.53.1662026-03-25 → 2026-03-25 · 2 obs
○ 2026-03-24 05:35:40
● 2026-03-25 18:02:24
○A54.243.117.1972026-03-24 → 2026-03-24 · 3 obs
○ 2026-03-19 05:28:14
● 2026-03-24 05:35:40
○ 2026-03-25 18:02:24
●A98.82.42.1392026-03-25 → 2026-03-25 · 2 obs
○ 2026-03-24 05:35:40
● 2026-03-25 18:02:24

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
comh.gtld-servers.net, l.gtld-servers.net, b.gtld-servers.net, j.gtld-servers.net...-
coursefirst.comnsg1.namebrightdns.com, nsg2.namebrightdns.com24 records

✅ Authoritative Response

Server:13.221.125.168

NS records: nsg1.namebrightdns.com, nsg2.namebrightdns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for coursefirst.com (unsigned zone)

⏱️ Timing

Total: 157ms | Queries: -

📄 Records

TypeCountSample Data
A298.82.42.139, 52.201.53.166
AAAA22600:1f18:4ae:c605:f094:2a0a:4985:526e, 2600:1f18:4ae:c606:def:b9d9:eb9e:7766
NS2nsg2.namebrightdns.com, nsg1.namebrightdns.com
TXT2v=spf1 -all, afternic-verification-G9G3tM8T8EwEizzPzj
SOA1ns1.namebrightdns.com dns.namebright.com

📌 Glue Records Collected

Total: 24

Out-of-bailiwick: 24 (nsg1.namebrightdns.com, nsg1.namebrightdns.com, nsg1.namebrightdns.com...)

Analysis

IP Addresses

Four IP numbers are pointed to by coursefirst.com: 2600:1f18:4ae:c605:f094:2a0a:4985:526e, 2600:1f18:4ae:c606:def:b9d9:eb9e:7766, 52.201.53.166 and 98.82.42.139.

other host names including ratemonk.com, falconehr.com, gardadvisors.com, 852go.com and www.dmnic.net share IP numbers with coursefirst.com.

Name Servers

coursefirst.com is delegated to three name servers ns1.namebrightdns.com, nsg1.namebrightdns.com and nsg2.namebrightdns.com.

coursefirst.com at least partially shares name servers with other domains, for instance underlicious.com, breadandbetter.com, phastlane.com, mscsport.com and pixeledifice.com.

These name servers are commonly used with ns2.namebrightdns.com, domain-for-sale.hugedomainsdns.com and forsale.hugedomainsdns.com.

Host names with twelve IP numbers:

nsg1.namebrightdns.com points to: 2600:1f18:683a:ae1a:894e:779f:a1ca:3cf5, 2600:1f18:683a:ae1a:e5a9:8ee2:a408:496a, 2600:1f18:683a:ae1b:dd1:87a9:86ad:6b5a, 2600:1f18:683a:ae1b:9806:d504:f0e4:26c, 2600:1f18:683a:ae1b:a00e:60bf:4fb5:f5b, 2600:1f18:683a:ae1b:b2d2:f9bf:c31b:7e61, 3.84.123.160, 3.89.209.21, 13.220.228.105, 44.220.149.224, 54.90.222.89 and 98.81.135.11.

nsg2.namebrightdns.com points to: 2600:1f18:683a:ae1a:2220:bd04:2603:2fe6, 2600:1f18:683a:ae1a:810d:d2b:3efc:2833, 2600:1f18:683a:ae1a:e1f7:fcf3:dce8:5758, 2600:1f18:683a:ae1a:e842:8110:107c:b494, 2600:1f18:683a:ae1b:130f:6e59:4e36:8c1e, 2600:1f18:683a:ae1b:4ce9:d414:4fb6:5821, 3.85.217.230, 13.221.125.168, 18.209.34.29, 34.201.103.40, 34.202.237.97 and 98.93.89.251.

Host names with four IP numbers:

ns1.namebrightdns.com points to: 2600:1f18:683a:ae1a:aa86:dc69:2f3:5dbe, 2600:1f18:683a:ae1b:6b86:f70d:6af7:3a27, 52.91.47.137 and 54.92.199.119.