b.githubusercontent.com - dns.ninja

`b.githubusercontent.com`

DNSSEC	⚠️ Not signed
A	185.199.108.133^{🇺🇸 Fastly185.199.108.0/24 GitHub - 185.199.108.0/24}
		PTR	`cdn-185-199-108-133.github.com`
A	185.199.109.133^{🇺🇸 Fastly185.199.109.0/24 GitHub - 185.199.109.0/24}
A	185.199.110.133^{🇺🇸 Fastly185.199.110.0/24 GitHub - 185.199.110.0/24}
A	185.199.111.133^{🇺🇸 Fastly185.199.111.0/24 GitHub - 185.199.111.0/24}

githubusercontent.comis a content-delivery domain operated by GitHub (a Microsoft subsidiary), used exclusively to serve static assets — raw source files, images, release artifacts, and Git LFS objects — from GitHub repositories, keeping user-supplied content isolated from the maingithub.comorigin for security reasons.

Key facts

Owner / operator: GitHub, Inc. (subsidiary of Microsoft Corporation)
TLD:.com— gTLD
Primary purpose: CDN origin for raw repository content, user-uploaded images, release assets, and Git LFS objects hosted on GitHub
Status: active

Notable subdomains or services

The domain is not a user-facing hosting service, but several well-known subdomain patterns exist:

raw.githubusercontent.com////— serves raw (unrendered) file content directly from any public repository branch or commit
avatars.githubusercontent.com— serves user and organisation avatar images
camo.githubusercontent.com— GitHub's image-proxy service (rewrites external images in Markdown through this origin)
objects.githubusercontent.com— serves Git LFS objects and release binary assets
user-images.githubusercontent.com— stores images uploaded by users in issues, pull requests, and comments
private-user-images.githubusercontent.com— same as above for private/authenticated contexts

Related domains

github.com— main GitHub platform (code hosting, pull requests, Actions, etc.)
github.io— GitHub Pages hosting; user sites follow the pattern.github.io
githubassets.com— serves GitHub's own UI static assets (JS, CSS, icons)

📈 Tranco rank: #738

Overview

githubusercontent.com is GitHub's content delivery network (CDN) domain used to serve user-generated content and static assets. It separates raw file content from the main github.com domain for security and performance reasons.

Primary Uses

raw.githubusercontent.com — Serves raw file content from repositories (source code, configuration files, scripts)
avatars.githubusercontent.com — Hosts user profile pictures and organization logos
camo.githubusercontent.com — Proxies external images in README files and issues for privacy/security
objects.githubusercontent.com — Serves Git LFS (Large File Storage) objects
user-images.githubusercontent.com — Hosts images uploaded to issues, comments, and discussions

Technical Infrastructure

DNS Provider: Dual-provider setup with AWS Route 53 and NS1 for redundancy

Nameservers:

AWS: ns-181.awsdns-22.com, ns-596.awsdns-10.net, ns-1867.awsdns-41.co.uk, ns-1411.awsdns-48.org
NS1: dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net, dns4.p01.nsone.net

Security: SPF record configured (v=spf1 a -all). DNSSEC is not enabled.

Ownership

Owned and operated by GitHub, Inc., a subsidiary of Microsoft Corporation since 2018. The domain serves billions of requests daily as part of GitHub's infrastructure supporting over 100 million developers worldwide.

Subdomains

217.b.githubusercontent.com

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DNS History

4 records (4 active, 0 former)

●A185.199.108.1332026-02-17 → 2026-06-04 · 2 obs

● 2026-02-17 12:00:04
● 2026-06-04 05:13:36

●A185.199.109.1332026-02-17 → 2026-06-04 · 2 obs

● 2026-02-17 12:00:04
● 2026-06-04 05:13:36

●A185.199.110.1332026-02-17 → 2026-06-04 · 2 obs

● 2026-02-17 12:00:04
● 2026-06-04 05:13:36

●A185.199.111.1332026-02-17 → 2026-06-04 · 2 obs

● 2026-02-17 12:00:04
● 2026-06-04 05:13:36

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
githubusercontent.com	ns-181.awsdns-22.com, ns-596.awsdns-10.net, ns-1867.awsdns-41.co.uk, ns-1411.awsdns-48.org...	2 records

✅ Authoritative Response

Server:198.51.45.1

NS records: ns-181.awsdns-22.com, ns-596.awsdns-10.net, ns-1867.awsdns-41.co.uk, ns-1411.awsdns-48.org, dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net, dns4.p01.nsone.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for githubusercontent.com (unsigned zone)

⏱️ Timing

Total: 817ms | Queries: -

📄 Records

Type	Count	Sample Data
A	4	`185.199.111.133, 185.199.108.133...`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns-181.awsdns-22.com, ns-181.awsdns-22.com)

Analysis

Hierarchy

217.b.githubusercontent.com is delegated beneath b.githubusercontent.com.

IP Addresses

b.githubusercontent.com points to 4 IP addresses — 185.199.108.133, 185.199.109.133, 185.199.110.133 and 185.199.111.133.

128.159nautilus.10machines1.githubusercontent.com, 10avatars1.githubusercontent.com, 18041641670813428517.githubusercontent.com plus two other host names have IP numbers in common with b.githubusercontent.com.

	DNSSEC	⚠️ Not signed
	NS	`dns1.p01.nsone.net` ⭐
	NS	`dns2.p01.nsone.net`
	NS	`dns3.p01.nsone.net`
	NS	`dns4.p01.nsone.net`
	NS	`ns-1411.awsdns-48.org`
	NS	`ns-181.awsdns-22.com`
	NS	`ns-1867.awsdns-41.co.uk`
	NS	`ns-596.awsdns-10.net`
	TXT	`globalsign-domain-verification=2wiwCKYW7kQ6LJntfIcdi5EG56lUlQIRj_VGJnEEKb`
	TXT	`v=spf1 a -all`
	SOA	`dns1.p01.nsone.net`hostmaster@nsone.net serial=1656467272