cs50.ca - dns.ninja

`cs50.ca`

DNSSEC	⚠️ Not signed
A	100.48.124.109^{🇺🇸 Amazon100.48.0.0/12 EC2 IAD prefix}
		PTR	`ec2-100-48-124-109.compute-1.amazonaws.com`
A	100.60.158.69^{🇺🇸 Amazon100.48.0.0/12 EC2 IAD prefix}
NS	`ns-86.awsdns-10.com` ⭐
		A	2600:9000:5300:5600::1^{🇺🇸 Amazon2600:9000:5300::/48 - CloudFront}
			PTR	`ns-86.awsdns-10.com`
		A	205.251.192.86^{🇺🇸 Amazon205.251.192.0/24 prefix}
			PTR	`ns-86.awsdns-10.com`
NS	`ns-1446.awsdns-52.org`
		A	2600:9000:5305:a600::1^{🇺🇸 Amazon2600:9000:5305::/48 - CloudFront}
			PTR	`ns-1446.awsdns-52.org`
		A	205.251.197.166^{🇺🇸 Amazon205.251.197.0/24 prefix}
			PTR	`ns-1446.awsdns-52.org`
NS	`ns-1558.awsdns-02.co.uk`
		A	2600:9000:5306:1600::1^{🇺🇸 Amazon2600:9000:5306::/48 - CloudFront}
			PTR	`ns-1558.awsdns-02.co.uk`
		A	205.251.198.22^{🇺🇸 Amazon205.251.198.0/24 prefix}
			PTR	`ns-1558.awsdns-02.co.uk`
NS	`ns-581.awsdns-08.net`
		A	2600:9000:5302:4500::1^{🇺🇸 Amazon2600:9000:5302::/48 - CloudFront}
			PTR	`ns-581.awsdns-08.net`
		A	205.251.194.69^{🇺🇸 Amazon205.251.194.0/24 prefix}
			PTR	`ns-581.awsdns-08.net`
SOA	`ns-86.awsdns-10.com`awsdns-hostmaster@amazon.com serial=1

`ca`

	DNSSEC	🔒 Signed (DS record present)
	NS	`prd-czp-05.corp.cira.ca` ⭐
	NS	`any.ca-servers.ca`
	NS	`c.ca-servers.ca`
	NS	`d.ca-servers.ca`
	NS	`j.ca-servers.ca`
	SOA	`prd-czp-05.corp.cira.ca`admin-dns@cira.ca serial=2607271230

Subdomains

www.cs50.ca

Same first word

cs50.eu

cs50.college

cs50.wiki

cs50.es

cs50.co.uk

cs50.com.ua

cs50.readthedocs.io

cs50.email

cs50.github.io

cs50.tk

cs50.com

cs50.at

cs50.university

cs50.net

cs50.io

cs50.events

cs50.org

cs50.productions

cs50.center

cs50.mobi

cs50.ly

cs50.tools

cs50.ca

cs50.zone

cs50.me

cs50.biz

cs50.in

cs50.link

cs50.dev

cs50.de

cs50.it

cs50.us

cs50.co

cs50.education

cs50.space

cs50.tf

cs50.ws

cs50.site

cs50.info

cs50.website

cs50.pro

cs50.tv

cs50.photos

cs50.xyz

Similar names

sc05.com

s50c.com

s50c.net

c50s.com

cs05.com

50cs.cn

sc05.org

50sc.df.gov.br

DNS History

14 records (6 active, 8 former)

●NSns-1446.awsdns-52.org2026-02-16 → 2026-07-27 · 2 obs

● 2026-02-16 12:37:04
● 2026-07-27 13:19:50

●NSns-1558.awsdns-02.co.uk2026-02-16 → 2026-07-27 · 2 obs

● 2026-02-16 12:37:04
● 2026-07-27 13:19:50

●NSns-581.awsdns-08.net2026-02-16 → 2026-07-27 · 2 obs

● 2026-02-16 12:37:04
● 2026-07-27 13:19:50

●NSns-86.awsdns-10.com2026-02-16 → 2026-07-27 · 2 obs

● 2026-02-16 12:37:04
● 2026-07-27 13:19:50

●A100.48.124.1092026-07-26 → 2026-07-27 · 3 obs

○ 2026-06-21 23:24:10
● 2026-07-26 07:51:22
● 2026-07-27 13:19:50

●A100.60.158.692026-07-26 → 2026-07-27 · 3 obs

○ 2026-06-21 23:24:10
● 2026-07-26 07:51:22
● 2026-07-27 13:19:50

○A23.21.205.1662026-06-15 → 2026-06-15 · 4 obs

○ 2026-02-24 17:04:12
● 2026-06-15 18:49:20
○ 2026-06-21 23:24:10
○ 2026-07-27 13:19:50

○A3.234.126.2132026-06-15 → 2026-06-15 · 4 obs

○ 2026-02-24 17:04:12
● 2026-06-15 18:49:20
○ 2026-06-21 23:24:10
○ 2026-07-27 13:19:50

○A44.199.6.892026-02-16 → 2026-02-24 · 4 obs

● 2026-02-16 12:37:04
● 2026-02-24 17:04:12
○ 2026-06-15 18:49:20
○ 2026-07-27 13:19:50

○A52.87.41.1832026-02-16 → 2026-07-27 · 2 obs

○ 2026-02-16 12:37:04
○ 2026-07-27 13:19:50

○A54.209.107.2462026-02-16 → 2026-07-27 · 2 obs

○ 2026-02-16 12:37:04
○ 2026-07-27 13:19:50

○A54.234.97.752026-02-16 → 2026-02-24 · 4 obs

● 2026-02-16 12:37:04
● 2026-02-24 17:04:12
○ 2026-06-15 18:49:20
○ 2026-07-27 13:19:50

○A54.243.138.2072026-06-21 → 2026-06-21 · 4 obs

○ 2026-06-15 18:49:20
● 2026-06-21 23:24:10
○ 2026-07-26 07:51:22
○ 2026-07-27 13:19:50

○A98.88.165.1222026-06-21 → 2026-06-21 · 4 obs

○ 2026-06-15 18:49:20
● 2026-06-21 23:24:10
○ 2026-07-26 07:51:22
○ 2026-07-27 13:19:50

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
ca	c.ca-servers.ca, any.ca-servers.ca, j.ca-servers.ca, d.ca-servers.ca	-
cs50.ca	ns-1446.awsdns-52.org, ns-86.awsdns-10.com, ns-581.awsdns-08.net, ns-1558.awsdns-02.co.uk	-

✅ Authoritative Response

Server:205.251.192.86

NS records: ns-1446.awsdns-52.org, ns-86.awsdns-10.com, ns-581.awsdns-08.net, ns-1558.awsdns-02.co.uk

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for cs50.ca (unsigned zone)

⏱️ Timing

Total: 1492ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`100.60.158.69, 100.48.124.109`
NS	4	`ns-1446.awsdns-52.org, ns-1558.awsdns-02.co.uk...`
SOA	1	`ns-86.awsdns-10.com awsdns-hostmaster.am`

Analysis

Hierarchy

The domain www.cs50.ca falls under the parent cs50.ca.

IP Addresses

cs50.ca points to the IP addresses 100.48.124.109 and 100.60.158.69

Name Servers

Four name servers handle the delegation for cs50.ca: ns-86.awsdns-10.com, ns-581.awsdns-08.net, ns-1446.awsdns-52.org and ns-1558.awsdns-02.co.uk.

At least some of cs50.ca's name servers are shared with other domains, for example chopserve.com, lji.institute, calebinthecloud.com and two more.

It is common for these name servers to be used in conjunction with the name servers ns-275.awsdns-34.com, ns-668.awsdns-19.net and ns-1836.awsdns-37.co.uk.

Four hostnames, each resolving to a pair of IP addresses: ns-86.awsdns-10.com directs to 205.251.192.86 and 2600:9000:5300:5600::1; ns-581.awsdns-08.net directs to 205.251.194.69 and 2600:9000:5302:4500::1; ns-1446.awsdns-52.org directs to 205.251.197.166 and 2600:9000:5305:a600::1; ns-1558.awsdns-02.co.uk directs to 205.251.198.22 and 2600:9000:5306:1600::1.