cs50.dev - dns.ninja

`cs50.dev`

DNSSEC	⚠️ Not signed
A	52.7.25.158^{🇺🇸 Amazon52.4.0.0/14 EC2 IAD prefix}
		PTR	`ec2-52-7-25-158.compute-1.amazonaws.com`
A	54.83.154.142^{🇺🇸 Amazon54.80.0.0/14 EC2 IAD prefix}
NS	`ns-1481.awsdns-57.org` ⭐
		A	2600:9000:5305:c900::1^{🇺🇸 Amazon2600:9000:5305::/48 - CloudFront}
			PTR	`ns-1481.awsdns-57.org`
		A	205.251.197.201^{🇺🇸 Amazon205.251.197.0/24 prefix}
			PTR	`ns-1481.awsdns-57.org`
NS	`ns-1712.awsdns-22.co.uk`
		A	2600:9000:5306:b000::1^{🇺🇸 Amazon2600:9000:5306::/48 - CloudFront}
			PTR	`ns-1712.awsdns-22.co.uk`
		A	205.251.198.176^{🇺🇸 Amazon205.251.198.0/24 prefix}
			PTR	`ns-1712.awsdns-22.co.uk`
NS	`ns-362.awsdns-45.com`
		A	2600:9000:5301:6a00::1^{🇺🇸 Amazon2600:9000:5301::/48 - CloudFront}
			PTR	`ns-362.awsdns-45.com`
		A	205.251.193.106^{🇺🇸 Amazon205.251.193.0/24 prefix}
			PTR	`ns-362.awsdns-45.com`
NS	`ns-932.awsdns-52.net`
		A	2600:9000:5303:a400::1^{🇺🇸 Amazon2600:9000:5303::/48 - CloudFront}
			PTR	`ns-932.awsdns-52.net`
		A	205.251.195.164^{🇺🇸 Amazon205.251.195.0/24 prefix}
			PTR	`ns-932.awsdns-52.net`
SOA	`ns-1481.awsdns-57.org`awsdns-hostmaster@amazon.com serial=1

`dev`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns-tld1.charlestonroadregistry.com` ⭐
	NS	`ns-tld2.charlestonroadregistry.com`
	NS	`ns-tld3.charlestonroadregistry.com`
	NS	`ns-tld4.charlestonroadregistry.com`
	NS	`ns-tld5.charlestonroadregistry.com`
	SOA	`ns-tld1.charlestonroadregistry.com`cloud-dns-hostmaster@google.com serial=1

📈 Tranco rank: #993,876
🔒 HSTS Preload (+subdomains)

Same first word

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

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

Similar names

s50c.net

c50s.com

cs05.com

50cs.cn

sc05.org

50sc.df.gov.br

sc05.com

s50c.com

DNS History

20 records (6 active, 14 former)

●NSns-1481.awsdns-57.org2026-02-17 → 2026-07-26 · 2 obs

● 2026-02-17 04:54:42
● 2026-07-26 10:15:42

●NSns-1712.awsdns-22.co.uk2026-02-17 → 2026-07-26 · 2 obs

● 2026-02-17 04:54:42
● 2026-07-26 10:15:42

●NSns-362.awsdns-45.com2026-02-17 → 2026-07-26 · 2 obs

● 2026-02-17 04:54:42
● 2026-07-26 10:15:42

●NSns-932.awsdns-52.net2026-02-17 → 2026-07-26 · 2 obs

● 2026-02-17 04:54:42
● 2026-07-26 10:15:42

○A100.56.208.642026-06-11 → 2026-06-11 · 5 obs

○ 2026-05-25 08:14:28
● 2026-06-11 18:40:04
● 2026-06-11 23:04:32
○ 2026-06-15 18:48:18
○ 2026-07-26 10:15:42

○A100.56.79.752026-06-15 → 2026-06-15 · 4 obs

○ 2026-06-11 23:04:32
● 2026-06-15 18:48:18
○ 2026-07-02 11:49:24
○ 2026-07-26 10:15:42

○A100.59.52.982026-07-02 → 2026-07-02 · 3 obs

○ 2026-06-15 18:48:18
● 2026-07-02 11:49:24
○ 2026-07-26 10:15:42

○A3.211.16.2502026-02-17 → 2026-07-26 · 2 obs

○ 2026-02-17 04:54:42
○ 2026-07-26 10:15:42

○A3.219.22.2272026-06-11 → 2026-06-15 · 5 obs

○ 2026-05-25 08:14:28
● 2026-06-11 18:40:04
● 2026-06-15 18:48:18
○ 2026-07-02 11:49:24
○ 2026-07-26 10:15:42

○A3.219.6.1862026-02-17 → 2026-02-24 · 4 obs

● 2026-02-17 04:54:42
● 2026-02-24 17:04:58
○ 2026-05-14 11:58:26
○ 2026-07-26 10:15:42

○A3.81.180.1102026-02-24 → 2026-02-24 · 4 obs

○ 2026-02-17 04:54:42
● 2026-02-24 17:04:58
○ 2026-05-14 11:58:26
○ 2026-07-26 10:15:42

○A52.21.75.1882026-05-14 → 2026-05-14 · 4 obs

○ 2026-02-24 17:04:58
● 2026-05-14 11:58:26
○ 2026-05-25 08:14:28
○ 2026-07-26 10:15:42

○A52.4.153.982026-02-17 → 2026-02-17 · 3 obs

● 2026-02-17 04:54:42
○ 2026-02-24 17:04:58
○ 2026-07-26 10:15:42

○A52.7.173.1092026-02-17 → 2026-07-26 · 2 obs

○ 2026-02-17 04:54:42
○ 2026-07-26 10:15:42

●A52.7.25.1582026-07-26 → 2026-07-26 · 2 obs

○ 2026-07-02 11:49:24
● 2026-07-26 10:15:42

○A52.86.208.1322026-05-25 → 2026-05-25 · 4 obs

○ 2026-05-14 11:58:26
● 2026-05-25 08:14:28
○ 2026-06-11 18:40:04
○ 2026-07-26 10:15:42

●A54.83.154.1422026-07-26 → 2026-07-26 · 2 obs

○ 2026-07-02 11:49:24
● 2026-07-26 10:15:42

○A98.80.35.2062026-05-25 → 2026-05-25 · 4 obs

○ 2026-05-14 11:58:26
● 2026-05-25 08:14:28
○ 2026-06-11 18:40:04
○ 2026-07-26 10:15:42

○A98.86.239.2162026-07-02 → 2026-07-02 · 3 obs

○ 2026-06-15 18:48:18
● 2026-07-02 11:49:24
○ 2026-07-26 10:15:42

○A98.95.68.1972026-05-14 → 2026-05-14 · 4 obs

○ 2026-02-24 17:04:58
● 2026-05-14 11:58:26
○ 2026-05-25 08:14:28
○ 2026-07-26 10:15:42

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
dev	ns-tld1.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com, ns-tld4.charlestonroadregistry.com...	-
cs50.dev	ns-1481.awsdns-57.org, ns-362.awsdns-45.com, ns-932.awsdns-52.net, ns-1712.awsdns-22.co.uk	-

✅ Authoritative Response

Server:205.251.198.176

NS records: ns-1481.awsdns-57.org, ns-362.awsdns-45.com, ns-932.awsdns-52.net, ns-1712.awsdns-22.co.uk

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for cs50.dev (unsigned zone)

⏱️ Timing

Total: 566ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`52.7.25.158, 54.83.154.142`
NS	4	`ns-1481.awsdns-57.org, ns-1712.awsdns-22.co.uk...`
SOA	1	`ns-1481.awsdns-57.org awsdns-hostmaster.`

Analysis

IP Addresses

cs50.dev resolves to the IP addresses 52.7.25.158 and 54.83.154.142

Other host names share IP numbers with cs50.dev; ec2-52-7-25-158.compute-1.amazonaws.com is one such example.

Name Servers

cs50.dev has four authoritative name servers: ns-362.awsdns-45.com, ns-932.awsdns-52.net, ns-1481.awsdns-57.org and ns-1712.awsdns-22.co.uk.

cs50.dev shares at least some of its name servers with other domains, including cdcframework.com, d9ojzk9dcmvxu.cloudfront.net, prod.treinta.co and two others.

The host names ns-362.awsdns-45.com, ns-932.awsdns-52.net, ns-1481.awsdns-57.org and ns-1712.awsdns-22.co.uk each resolve to two IP addresses: ns-362.awsdns-45.com resolves to 205.251.193.106 and 2600:9000:5301:6a00::1; ns-932.awsdns-52.net resolves to 205.251.195.164 and 2600:9000:5303:a400::1; ns-1481.awsdns-57.org resolves to 205.251.197.201 and 2600:9000:5305:c900::1; ns-1712.awsdns-22.co.uk resolves to 205.251.198.176 and 2600:9000:5306:b000::1.