classrunner.com - robtex.com

classrunner.com

DNSSEC⚠️ Not signed
A104.21.92.31Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.185.91🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSdave.ns.cloudflare.com ⭐
A2606:4700:58::adf5:3b6d🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdave.ns.cloudflare.com
A2803:f800:50::6ca2:c16d🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRdave.ns.cloudflare.com
A2a06:98c1:50::ac40:216d🇺🇸 Cloudflare2a06:98c1:50::/45
PTRdave.ns.cloudflare.com
A108.162.193.109🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdave.ns.cloudflare.com
A172.64.33.109🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdave.ns.cloudflare.com
A173.245.59.109🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdave.ns.cloudflare.com
NSerin.ns.cloudflare.com
A2606:4700:50::adf5:3a71🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRerin.ns.cloudflare.com
A2803:f800:50::6ca2:c071🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRerin.ns.cloudflare.com
A2a06:98c1:50::ac40:2071🇺🇸 Cloudflare2a06:98c1:50::/45
PTRerin.ns.cloudflare.com
A108.162.192.113🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRerin.ns.cloudflare.com
A172.64.32.113🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRerin.ns.cloudflare.com
A173.245.58.113🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRerin.ns.cloudflare.com
MXmx1.forwardemail.net ⭐
A2604:a880:2:d0::306:1🇺🇸 DIGITALOCEAN2604:a880:2::/48 DigitalOcean
PTRmx1.forwardemail.net
A2a02:6ea0:d71e::2🇺🇸 CDN772a02:6ea0:d700::/40 Denver IPv6
PTRmx1.forwardemail.net
A121.127.44.56🇺🇸 CDN77121.127.44.0/24 Denver
PTRmx1.forwardemail.net
A138.197.213.185🇺🇸 DIGITALOCEAN138.197.208.0/20 DigitalOcean
PTRmx1.forwardemail.net
MXmx2.forwardemail.net(20)
A2604:a880:400:d1::cd:9001🇺🇸 DIGITALOCEAN2604:a880:400::/48 DigitalOcean
PTRmx2.forwardemail.net
A2a02:6ea0:d71e::1🇺🇸 CDN772a02:6ea0:d700::/40 Denver IPv6
PTRmx2.forwardemail.net
A104.248.224.170🇺🇸 DIGITALOCEAN104.248.224.0/20 DigitalOcean
PTRmx2.forwardemail.net
A121.127.44.59🇺🇸 CDN77121.127.44.0/24 Denver
PTRmx2.forwardemail.net
TXTforward-email-site-verification=D6EpDwSMK0
TXTv=spf1 include:spf.forwardemail.net include:mailgun.org ~all
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.92.31, 172.67.185.91
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=103, name=cloudflare-ech.com
SOAdave.ns.cloudflare.comdns@cloudflare.com serial=2406082354

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=1783779497

Same first word

classrunner.com

DNS History

16 records (6 active, 10 former)

20162017201820192020202120222023202420252026NSdave.ns.cloudflare.comerin.ns.cloudflare.comns27.domaincontrol.comns28.domaincontrol.comMXmx1.forwardemail.netmx2.forwardemail.netmxa.mailgun.orgmxb.mailgun.orgnew.classrunner.comA104.21.92.31172.67.185.91104.27.176.162104.27.177.162170.75.162.62400:cb00:2048:1::681b:b0a22400:cb00:2048:1::681b:b1a2
●NSdave.ns.cloudflare.com2016-12-31 → 2026-07-11 · 3 obs
○ 2016-04-23 21:05:56
● 2016-12-31 23:45:22
● 2026-07-11 14:28:34
●NSerin.ns.cloudflare.com2016-12-31 → 2026-07-11 · 3 obs
○ 2016-04-23 21:05:56
● 2016-12-31 23:45:22
● 2026-07-11 14:28:34
○NSns27.domaincontrol.com2015-07-09 → 2016-04-23 · 4 obs
● 2015-07-09 13:44:30
● 2016-04-23 21:05:56
○ 2016-12-31 23:45:22
○ 2026-07-11 14:28:34
○NSns28.domaincontrol.com2015-07-09 → 2016-04-23 · 4 obs
● 2015-07-09 13:44:30
● 2016-04-23 21:05:56
○ 2016-12-31 23:45:22
○ 2026-07-11 14:28:34
●MXmx1.forwardemail.net2026-02-17 → 2026-07-11 · 3 obs
○ 2017-01-27 16:52:54
● 2026-02-17 12:02:08
● 2026-07-11 14:28:34
●MXmx2.forwardemail.net2026-02-17 → 2026-07-11 · 3 obs
○ 2017-01-27 16:52:54
● 2026-02-17 12:02:08
● 2026-07-11 14:28:34
○MXmxa.mailgun.org2017-01-27 → 2017-01-27 · 4 obs
○ 2016-12-31 23:45:22
● 2017-01-27 16:52:54
○ 2026-02-17 12:02:08
○ 2026-07-11 14:28:34
○MXmxb.mailgun.org2017-01-27 → 2017-01-27 · 4 obs
○ 2016-12-31 23:45:22
● 2017-01-27 16:52:54
○ 2026-02-17 12:02:08
○ 2026-07-11 14:28:34
○MXnew.classrunner.com2015-07-09 → 2016-12-31 · 4 obs
● 2015-07-09 13:44:30
● 2016-12-31 23:45:22
○ 2017-01-27 16:52:54
○ 2026-07-11 14:28:34
●A104.21.92.312026-02-17 → 2026-07-11 · 3 obs
○ 2017-01-27 16:52:54
● 2026-02-17 12:02:08
● 2026-07-11 14:28:34
○A104.27.176.1622016-12-31 → 2017-01-27 · 5 obs
○ 2016-04-23 21:05:56
● 2016-12-31 23:45:22
● 2017-01-27 16:52:54
○ 2026-02-17 12:02:08
○ 2026-07-11 14:28:34
○A104.27.177.1622016-12-31 → 2017-01-27 · 5 obs
○ 2016-04-23 21:05:56
● 2016-12-31 23:45:22
● 2017-01-27 16:52:54
○ 2026-02-17 12:02:08
○ 2026-07-11 14:28:34
○A170.75.162.62015-07-09 → 2016-04-23 · 4 obs
● 2015-07-09 13:44:30
● 2016-04-23 21:05:56
○ 2016-12-31 23:45:22
○ 2026-07-11 14:28:34
●A172.67.185.912026-02-17 → 2026-07-11 · 3 obs
○ 2017-01-27 16:52:54
● 2026-02-17 12:02:08
● 2026-07-11 14:28:34
○A2400:cb00:2048:1::681b:b0a22016-12-31 → 2016-12-31 · 4 obs
○ 2016-04-23 21:05:56
● 2016-12-31 23:45:22
○ 2017-01-27 16:52:54
○ 2026-07-11 14:28:34
○A2400:cb00:2048:1::681b:b1a22016-12-31 → 2016-12-31 · 4 obs
○ 2016-04-23 21:05:56
● 2016-12-31 23:45:22
○ 2017-01-27 16:52:54
○ 2026-07-11 14:28:34

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coma.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...-
classrunner.comdave.ns.cloudflare.com, erin.ns.cloudflare.com12 records

✅ Authoritative Response

Server:108.162.193.109

NS records: dave.ns.cloudflare.com, erin.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for classrunner.com (unsigned zone)

⏱️ Timing

Total: 155ms | Queries: -

📄 Records

TypeCountSample Data
A2172.67.185.91, 104.21.92.31
NS2dave.ns.cloudflare.com, erin.ns.cloudflare.com
MX2mx1.forwardemail.net (pri: 10), mx2.forwardemail.net (pri: 20)
TXT2forward-email-site-verification=D6EpDwSM, v=spf1 include:spf.forwardemail.net incl
HTTPS1{"priority":1,"target":".","alpn":["h3",
SOA1dave.ns.cloudflare.com dns.cloudflare.co

📌 Glue Records Collected

Total: 12

Out-of-bailiwick: 12 (dave.ns.cloudflare.com, dave.ns.cloudflare.com, dave.ns.cloudflare.com...)

Analysis

IP Addresses

classrunner.com points to the IP addresses 104.21.92.31 and 172.67.185.91

hamserver.org, trippynature.com, agritronixcorp.com and two other host names share IP numbers with classrunner.com.

Name Servers

DNS delegation for classrunner.com points to two name servers: dave.ns.cloudflare.com and erin.ns.cloudflare.com.

classrunner.com uses the same name servers as several other domains — among them hirak.fun, mccann.io, nicknamepress.com and two more.

The name servers of classrunner.com overlap at least partially with those of other domains — among them rankolog.com, exomeds.com, expresswirerope.com and two more.

The name servers mimi.ns.cloudflare.com, lex.ns.cloudflare.com and dana.ns.cloudflare.com are commonly seen alongside these name servers.

Hostnames that resolve to 6 IP addresses:

dave.ns.cloudflare.com has IP addresses 108.162.193.109, 172.64.33.109 and 173.245.59.109, plus 3 other.

erin.ns.cloudflare.com has IP addresses 108.162.192.113, 172.64.32.113 and 173.245.58.113, plus 3 other.

Mail Servers

Mail for classrunner.com is handled by two mail servers — mx1.forwardemail.net and mx2.forwardemail.net.

classrunner.com uses an identical mail server configuration to several other domains — among them deathe.org, wendywilmotproperties.com, learnsilo.com and two more.

The mail servers for classrunner.com overlap at least partially with those of other domains, including phucquach.com and dogturtle.com.

Hosts mx1.forwardemail.net and mx2.forwardemail.net each point to four IP addresses: mx1.forwardemail.net resolves to 121.127.44.56, 138.197.213.185, 2604:a880:2:d0::306:1 and 2a02:6ea0:d71e::2, and mx2.forwardemail.net resolves to 104.248.224.170, 121.127.44.59, 2604:a880:400:d1::cd:9001 and 2a02:6ea0:d71e::1.