ctfas.org - robtex.com

ctfas.org

DNSSEC⚠️ Not signed
A18.136.68.161🇸🇬 Amazon18.136.0.0/16 EC2 SIN prefix
PTRec2-18-136-68-161.ap-southeast-1.compute.amazonaws.com
A52.74.19.41🇸🇬 Amazon52.74.0.0/16 SIN prefix
NSns-194.awsdns-24.com ⭐
A2600:9000:5300:c200::1🇺🇸 Amazon2600:9000:5300::/48 - CloudFront
PTRns-194.awsdns-24.com
A205.251.192.194🇺🇸 Amazon205.251.192.0/24 prefix
PTRns-194.awsdns-24.com
NSns-1167.awsdns-17.org
A2600:9000:5304:8f00::1🇺🇸 Amazon2600:9000:5304::/48 - CloudFront
PTRns-1167.awsdns-17.org
A205.251.196.143🇺🇸 Amazon205.251.196.0/24 prefix
PTRns-1167.awsdns-17.org
NSns-1991.awsdns-56.co.uk
A2600:9000:5307:c700::1🇺🇸 Amazon2600:9000:5307::/48 - CloudFront
PTRns-1991.awsdns-56.co.uk
A205.251.199.199🇺🇸 Amazon205.251.199.0/24 prefix
PTRns-1991.awsdns-56.co.uk
NSns-675.awsdns-20.net
A2600:9000:5302:a300::1🇺🇸 Amazon2600:9000:5302::/48 - CloudFront
PTRns-675.awsdns-20.net
A205.251.194.163🇺🇸 Amazon205.251.194.0/24 prefix
PTRns-675.awsdns-20.net
MXsmtp.google.com ⭐
A2607:f8b0:4023:1004::1a🇺🇸 Google2607:f8b0::/32
PTRrq-in-f26.1e100.net
A2607:f8b0:4023:1004::1b🇺🇸 Google2607:f8b0::/32
PTRrq-in-f27.1e100.net
A2607:f8b0:4023:1011::1a🇺🇸 Google2607:f8b0::/32
PTRncdfwo-in-f26.1e100.net
A2607:f8b0:4023:1011::1b🇺🇸 Google2607:f8b0::/32
PTRncdfwo-in-f27.1e100.net
A142.250.26.26🇺🇸 Google142.250.26.0/24
PTRncdfwo-in-f26.1e100.net
A142.250.26.27🇺🇸 Google142.250.26.0/24
PTRncdfwo-in-f27.1e100.net
A142.250.114.27🇺🇸 Google142.250.114.0/24
PTRrr-in-f27.1e100.net
A142.250.115.26🇺🇸 Google142.250.115.0/24
PTRrq-in-f26.1e100.net
A142.250.115.27🇺🇸 Google142.250.115.0/24
PTRrq-in-f27.1e100.net
TXTbrevo-code:5f4005fb7bf261f578b9f8ade225537e
TXTgoogle-site-verification=jqp4imYh9UOhEwn7nsoq9td0I1HZdQN0G-WwBHbFIrs
TXTv=spf1 include:_spf.google.com ~all
SOAns-194.awsdns-24.comawsdns-hostmaster@amazon.com serial=1

org

DNSSEC🔒 Signed (DS record present)
NSa0.org.afilias-nst.info ⭐ ⚠️ Not in parent delegation
NSa2.org.afilias-nst.info ⚠️ Not in parent delegation
NSb0.org.afilias-nst.org
NSb2.org.afilias-nst.org
NSc0.org.afilias-nst.info ⚠️ Not in parent delegation
NSd0.org.afilias-nst.org
SOAa0.org.afilias-nst.infohostmaster@donuts.email serial=1771291736

Subdomains

dc-be3812fb38de.ctfas.org
mail.ctfas.org

Same first word

ctfas.org
ctfas.com
ctfas.de

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DNS History

20 records (7 active, 13 former)

202120222023202420252026NSns-1167.awsdns-17.orgns-194.awsdns-24.comns-1991.awsdns-56.co.ukns-675.awsdns-20.netchin.ns.cloudflare.comivan.ns.cloudflare.comMXsmtp.google.comdc-be3812fb38de.ctfas.orgA18.136.68.16152.74.19.41104.31.90.249104.31.91.24913.229.41.21413.250.84.25313.251.15.1862606:4700:3030::681f:5af92606:4700:3031::681f:5bf93.1.67.17746.137.249.9854.151.177.221
○NSchin.ns.cloudflare.com2020-03-17 → 2020-03-17 · 3 obs
● 2020-03-17 23:35:06
○ 2026-02-17 03:03:24
○ 2026-03-10 05:49:32
○NSivan.ns.cloudflare.com2020-03-17 → 2020-03-17 · 3 obs
● 2020-03-17 23:35:06
○ 2026-02-17 03:03:24
○ 2026-03-10 05:49:32
●NSns-1167.awsdns-17.org2026-02-17 → 2026-03-10 · 3 obs
○ 2020-03-17 23:35:06
● 2026-02-17 03:03:24
● 2026-03-10 05:49:32
●NSns-194.awsdns-24.com2026-02-17 → 2026-03-10 · 3 obs
○ 2020-03-17 23:35:06
● 2026-02-17 03:03:24
● 2026-03-10 05:49:32
●NSns-1991.awsdns-56.co.uk2026-02-17 → 2026-03-10 · 3 obs
○ 2020-03-17 23:35:06
● 2026-02-17 03:03:24
● 2026-03-10 05:49:32
●NSns-675.awsdns-20.net2026-02-17 → 2026-03-10 · 3 obs
○ 2020-03-17 23:35:06
● 2026-02-17 03:03:24
● 2026-03-10 05:49:32
○MXdc-be3812fb38de.ctfas.org2020-03-17 → 2020-03-17 · 3 obs
● 2020-03-17 23:35:06
○ 2026-02-17 03:03:24
○ 2026-03-10 05:49:32
●MXsmtp.google.com2026-02-17 → 2026-03-10 · 3 obs
○ 2020-03-17 23:35:06
● 2026-02-17 03:03:24
● 2026-03-10 05:49:32
○A104.31.90.2492020-03-17 → 2020-03-17 · 3 obs
● 2020-03-17 23:35:06
○ 2026-02-17 03:03:24
○ 2026-03-10 05:49:32
○A104.31.91.2492020-03-17 → 2020-03-17 · 3 obs
● 2020-03-17 23:35:06
○ 2026-02-17 03:03:24
○ 2026-03-10 05:49:32
○A13.229.41.2142026-02-17 → 2026-03-10 · 2 obs
○ 2026-02-17 03:03:24
○ 2026-03-10 05:49:32
○A13.250.84.2532026-02-17 → 2026-02-20 · 5 obs
○ 2020-03-17 23:35:06
● 2026-02-17 03:03:24
● 2026-02-20 02:40:42
○ 2026-03-02 20:46:18
○ 2026-03-10 05:49:32
○A13.251.15.1862026-03-02 → 2026-03-02 · 4 obs
○ 2026-02-20 02:40:42
● 2026-03-02 20:46:18
○ 2026-03-10 05:49:30
○ 2026-03-10 05:49:32
●A18.136.68.1612026-03-10 → 2026-03-10 · 3 obs
○ 2026-03-02 20:46:18
● 2026-03-10 05:49:30
● 2026-03-10 05:49:32
○A2606:4700:3030::681f:5af92020-03-17 → 2020-03-17 · 3 obs
● 2020-03-17 23:35:06
○ 2026-02-17 03:03:24
○ 2026-03-10 05:49:32
○A2606:4700:3031::681f:5bf92020-03-17 → 2020-03-17 · 3 obs
● 2020-03-17 23:35:06
○ 2026-02-17 03:03:24
○ 2026-03-10 05:49:32
○A3.1.67.1772026-02-17 → 2026-03-10 · 2 obs
○ 2026-02-17 03:03:24
○ 2026-03-10 05:49:32
○A46.137.249.982026-03-02 → 2026-03-02 · 4 obs
○ 2026-02-20 02:40:42
● 2026-03-02 20:46:18
○ 2026-03-10 05:49:30
○ 2026-03-10 05:49:32
●A52.74.19.412026-03-10 → 2026-03-10 · 3 obs
○ 2026-03-02 20:46:18
● 2026-03-10 05:49:30
● 2026-03-10 05:49:32
○A54.151.177.2212026-02-17 → 2026-02-20 · 5 obs
○ 2020-03-17 23:35:06
● 2026-02-17 03:03:24
● 2026-02-20 02:40:42
○ 2026-03-02 20:46:18
○ 2026-03-10 05:49:32

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
orgb2.org.afilias-nst.org, d0.org.afilias-nst.org, b0.org.afilias-nst.org-
ctfas.orgns-1991.awsdns-56.co.uk, ns-194.awsdns-24.com, ns-1167.awsdns-17.org, ns-675.awsdns-20.net1 record

✅ Authoritative Response

Server: 205.251.192.194

NS records: ns-1991.awsdns-56.co.uk, ns-194.awsdns-24.com, ns-1167.awsdns-17.org, ns-675.awsdns-20.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for ctfas.org (unsigned zone)

⏱️ Timing

Total: 473ms | Queries: -

📄 Records

TypeCountSample Data
A252.74.19.41, 18.136.68.161
NS4ns-1167.awsdns-17.org, ns-194.awsdns-24.com...
MX1smtp.google.com (pri: 1)
TXT3brevo-code:5f4005fb7bf261f578b9f8ade2255, google-site-verification=jqp4imYh9UOhEwn...
SOA1ns-194.awsdns-24.com awsdns-hostmaster.a

📌 Glue Records Collected

Total: 1

Out-of-bailiwick: 1 (ns-1167.awsdns-17.org)

Analysis

Hierarchy

ctfas.org is a parent of dc-be3812fb38de.ctfas.org and mail.ctfas.org.

IP Addresses

ctfas.org points to two IPs: 18.136.68.161 and 52.74.19.41.

Other host names, for example, ec2-52-74-19-41.ap-southeast-1.compute.amazonaws.com share IP numbers with ctfas.org.

Name Servers

ctfas.org is delegated to four name servers: ns-194.awsdns-24.com, ns-675.awsdns-20.net, ns-1167.awsdns-17.org and ns-1991.awsdns-56.co.uk.

ctfas.org at least partially shares name servers with other domains such as conema.link, outbackmenus.com, monitoring.af-south-1.amazonaws.com, d1ig2qwzkbmnvn.cloudfront.net and df9fe9hxhz4x8.cloudfront.net.

These name servers are commonly used alongside ns-692.awsdns-22.net, ns-1269.awsdns-30.org and ns-1600.awsdns-08.co.uk.

Host names with two IP numbers:

ns-194.awsdns-24.com points to 2600:9000:5300:c200::1 and 205.251.192.194

ns-675.awsdns-20.net points to 2600:9000:5302:a300::1 and 205.251.194.163

ns-1167.awsdns-17.org points to 2600:9000:5304:8f00::1 and 205.251.196.143

ns-1991.awsdns-56.co.uk points to 2600:9000:5307:c700::1 and 205.251.199.199

Mail Servers

ctfas.org is handled by a single mail server, smtp.google.com.

ctfas.org shares the same mail server setup as other domains, including huenailbar.com, ayahuascatoday.com, pcinet.com.br, huahaishiye.com and cvups.com.

ctfas.org shares mail servers with other domains at least in part, for instance eatssports.com, toereki.de, inemneiva.edu.co, beckav.com and greenwoodstudio.ca.

These mail servers are often used together with alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, alt3.aspmx.l.google.com, alt4.aspmx.l.google.com and aspmx.l.google.com.

Host name smtp.google.com points to nine IP numbers: 2607:f8b0:4023:1004::1a, 2607:f8b0:4023:1004::1b, 2607:f8b0:4023:1011::1a, 2607:f8b0:4023:1011::1b, 142.250.26.26, 142.250.26.27, 142.250.114.27, 142.250.115.26 and 142.250.115.27.