course55.com - robtex.com

course55.com

DNSSEC⚠️ Not signed
A2606:4700:3030::6815:5125🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3032::ac43:bc28🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.81.37Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.188.40🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSdamon.ns.cloudflare.com ⭐
A2606:4700:58::adf5:3b60🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdamon.ns.cloudflare.com
A2803:f800:50::6ca2:c160🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRdamon.ns.cloudflare.com
A2a06:98c1:50::ac40:2160🇺🇸 Cloudflare2a06:98c1:50::/45
PTRdamon.ns.cloudflare.com
A108.162.193.96🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdamon.ns.cloudflare.com
A172.64.33.96🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdamon.ns.cloudflare.com
A173.245.59.96🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdamon.ns.cloudflare.com
NSsasha.ns.cloudflare.com
A2606:4700:50::a29f:2645🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRsasha.ns.cloudflare.com
A2803:f800:50::6ca2:c245🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRsasha.ns.cloudflare.com
A2a06:98c1:50::ac40:2245🇺🇸 Cloudflare2a06:98c1:50::/45
PTRsasha.ns.cloudflare.com
A108.162.194.69🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRsasha.ns.cloudflare.com
A162.159.38.69Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRsasha.ns.cloudflare.com
A172.64.34.69🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRsasha.ns.cloudflare.com
MXaspmx.l.google.com ⭐
A2607:f8b0:4004:c25::1b🇺🇸 Google2607:f8b0:4004::/48
PTRyuiadtq-in-f27.1e100.net
A192.178.155.27🇺🇸 Google192.178.155.0/24
PTRyuiadrs-in-f27.1e100.net
MXeforward1.registrar-servers.com(10)
A162.255.118.51🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES
PTReforward1.registrar-servers.com
PTReforward3.registrar-servers.com
MXeforward2.registrar-servers.com(10)
A162.255.118.52🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES
PTReforward2.registrar-servers.com
MXeforward3.registrar-servers.com(10)
A162.255.118.51🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES
PTReforward1.registrar-servers.com
PTReforward3.registrar-servers.com
MXeforward4.registrar-servers.com(15)
A162.255.118.52🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES
PTReforward2.registrar-servers.com
MXeforward5.registrar-servers.com(20)
A162.255.118.51🇺🇸 NAMCHEAP-PH162.255.118.0/24 Namecheap, Inc. 11400 W. Olympic Blvd. Suite 200 Los Angeles, CA 90064 UNITED STATES
PTReforward1.registrar-servers.com
PTReforward3.registrar-servers.com
TXTgoogle-site-verification=fPnRZrf3Fhpp9HwE14cXW3-ZY-ptZYX3SztQsH135f0
TXTgoogle._domainkey.course55.com
TXTv=spf1 include:_spf.google.com ~all
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.81.37, 172.67.188.40
IPv6 hints2606:4700:3030::6815:5125, 2606:4700:3032::ac43:bc28
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=105, name=cloudflare-ech.com
SOAdamon.ns.cloudflare.comdns@cloudflare.com serial=2400449378

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=1777182256

Subdomains

www.course55.com

Same first word

course55.com

DNS History

15 records (12 active, 3 former)

2020202120222023202420252026NSdamon.ns.cloudflare.comsasha.ns.cloudflare.comv1s1.xundns.comv1s2.xundns.comMXaspmx.l.google.comeforward1.registrar-servers.comeforward2.registrar-servers.comeforward3.registrar-servers.comeforward4.registrar-servers.comeforward5.registrar-servers.comA104.21.81.37172.67.188.402606:4700:3030::6815:51252606:4700:3032::ac43:bc2823.80.227.71
●NSdamon.ns.cloudflare.com2026-04-18 → 2026-04-26 · 3 obs
○ 2019-04-20 21:58:58
● 2026-04-18 03:51:20
● 2026-04-26 05:48:22
●NSsasha.ns.cloudflare.com2026-04-18 → 2026-04-26 · 3 obs
○ 2019-04-20 21:58:58
● 2026-04-18 03:51:20
● 2026-04-26 05:48:22
○NSv1s1.xundns.com2019-04-20 → 2019-04-20 · 3 obs
● 2019-04-20 21:58:58
○ 2026-04-18 03:51:20
○ 2026-04-26 05:48:22
○NSv1s2.xundns.com2019-04-20 → 2019-04-20 · 3 obs
● 2019-04-20 21:58:58
○ 2026-04-18 03:51:20
○ 2026-04-26 05:48:22
●MXaspmx.l.google.com2026-04-18 → 2026-04-26 · 2 obs
● 2026-04-18 03:51:20
● 2026-04-26 05:48:22
●MXeforward1.registrar-servers.com2026-04-18 → 2026-04-26 · 2 obs
● 2026-04-18 03:51:20
● 2026-04-26 05:48:22
●MXeforward2.registrar-servers.com2026-04-18 → 2026-04-26 · 2 obs
● 2026-04-18 03:51:20
● 2026-04-26 05:48:22
●MXeforward3.registrar-servers.com2026-04-18 → 2026-04-26 · 2 obs
● 2026-04-18 03:51:20
● 2026-04-26 05:48:22
●MXeforward4.registrar-servers.com2026-04-18 → 2026-04-26 · 2 obs
● 2026-04-18 03:51:20
● 2026-04-26 05:48:22
●MXeforward5.registrar-servers.com2026-04-18 → 2026-04-26 · 2 obs
● 2026-04-18 03:51:20
● 2026-04-26 05:48:22
●A104.21.81.372026-04-18 → 2026-04-26 · 3 obs
○ 2019-04-20 21:58:58
● 2026-04-18 03:51:20
● 2026-04-26 05:48:22
●A172.67.188.402026-04-18 → 2026-04-26 · 3 obs
○ 2019-04-20 21:58:58
● 2026-04-18 03:51:20
● 2026-04-26 05:48:22
○A23.80.227.712019-04-20 → 2019-04-20 · 3 obs
● 2019-04-20 21:58:58
○ 2026-04-18 03:51:20
○ 2026-04-26 05:48:22
●A2606:4700:3030::6815:51252026-04-18 → 2026-04-26 · 3 obs
○ 2019-04-20 21:58:58
● 2026-04-18 03:51:20
● 2026-04-26 05:48:22
●A2606:4700:3032::ac43:bc282026-04-18 → 2026-04-26 · 3 obs
○ 2019-04-20 21:58:58
● 2026-04-18 03:51:20
● 2026-04-26 05:48:22

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coml.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...-
course55.comdamon.ns.cloudflare.com, sasha.ns.cloudflare.com12 records

✅ Authoritative Response

Server:108.162.194.69

NS records: damon.ns.cloudflare.com, sasha.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for course55.com (unsigned zone)

⏱️ Timing

Total: 541ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.81.37, 172.67.188.40
AAAA22606:4700:3032::ac43:bc28, 2606:4700:3030::6815:5125
NS2damon.ns.cloudflare.com, sasha.ns.cloudflare.com
MX6aspmx.l.google.com (pri: 1), eforward1.registrar-servers.com (pri: 10...
TXT3google-site-verification=fPnRZrf3Fhpp9Hw, google._domainkey.course55.com...
HTTPS1{"priority":1,"target":".","alpn":["h3",
SOA1damon.ns.cloudflare.com dns.cloudflare.c

📌 Glue Records Collected

Total: 12

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

Analysis

Hierarchy

www.course55.com has course55.com as its parent.

IP Addresses

course55.com maps to four IP numbers: 2606:4700:3030::6815:5125, 2606:4700:3032::ac43:bc28, 104.21.81.37 and 172.67.188.40.

Other host names, for instance xtlist.com, s868vip.com, www.psychic-contact.com, axhua.com and buaya77.org share IP numbers with course55.com.

Name Servers

Two name servers damon.ns.cloudflare.com and sasha.ns.cloudflare.com are delegated to course55.com.

course55.com uses the same name server configuration as other domains, such as cybervalidate.com, xn--7dbrfb.co.il, elimel.co.il, buytorich.com and 85.187.194.in-addr.arpa.

course55.com at least partially shares name servers with other domains such as maxegatos.net, blockfhain.com, slotsfeedfocushub.co.uk, mortgage-calculators.org and robertsinn.com.

These name servers are commonly used with nile.ns.cloudflare.com and susan.ns.cloudflare.com.

Host names with six IP numbers: Host name damon.ns.cloudflare.com points to 2606:4700:58::adf5:3b60, 2803:f800:50::6ca2:c160, 2a06:98c1:50::ac40:2160, 108.162.193.96, 172.64.33.96 and 173.245.59.96; host name sasha.ns.cloudflare.com points to 2606:4700:50::a29f:2645, 2803:f800:50::6ca2:c245, 2a06:98c1:50::ac40:2245, 108.162.194.69, 162.159.38.69 and 172.64.34.69.

Mail Servers

course55.com is handled by six mail servers: eforward1.registrar-servers.com, eforward2.registrar-servers.com, eforward3.registrar-servers.com, eforward4.registrar-servers.com, eforward5.registrar-servers.com and aspmx.l.google.com.

course55.com shares mail servers with other domains at least in part, for instance youssefel.com, ns500671.ns500731.ns500742.ns500754.ns500671.ns500688.ns500678.ns500704.ns500678.ns500688.tenderladiesbz.com, ns500759.ns500758.ns500759.ns500759.ns500698.ns500736.ns500735.ns500698.ns500698.ns500698.ns500698.ns500708.ns500652.ns500619.ns500619.trackreceptor.com, ns500754.ns500742.ns500754.ns500671.ns500704.ns500704.ns500704.ns500705.ns500688.ns500671.ns500678.ns500688.ns500671.ns500649.lustychickser.com and russoarquitectura.cl.

These mail servers are commonly used together with the mail servers alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, alt3.aspmx.l.google.com, alt4.aspmx.l.google.com, eforward6.registrar-servers.com, eforward7.registrar-servers.com, aspmx2.googlemail.com and aspmx3.googlemail.com.

Host names with two IPs:

aspmx.l.google.com points to 2607:f8b0:4004:c25::1b and 192.178.155.27.

Host names with a single IP:

eforward1.registrar-servers.com points to 162.255.118.51.

eforward3.registrar-servers.com points to 162.255.118.51.

eforward5.registrar-servers.com points to 162.255.118.51.

eforward2.registrar-servers.com points to 162.255.118.52.

eforward4.registrar-servers.com points to 162.255.118.52.

Host names pointing to 162.255.118.51: eforward1.registrar-servers.com, eforward3.registrar-servers.com and eforward5.registrar-servers.com.

Host names pointing to 162.255.118.52: eforward2.registrar-servers.com and eforward4.registrar-servers.com.