Builders FirstSource bldr.com Partial data, full scan by Oct 30
Fortune 500 rank #296 · Materials · Building Materials, Glass · BLDR
Last scanned 2026-10-19 · next scan Fri, Oct 30
Full DNS records & evidence → NS, MX, mail and SPF senders, verification vendors, certificate authorities, CNAME chains, ASNs and history per hostname
AI vendors verified: Anthropic · Lovable
DNS
DNS, traffic-weighted: Builders FirstSource
DNS by hostname count: Builders FirstSource
Zones (1)
Each DNS zone that holds a scanned hostname: the domain apex, brand domains and any delegated subdomain. Two vendors on one zone = secondary DNS.
| Zone | DNS provider | Nameservers | Hostnames | Key |
|---|---|---|---|---|
| bldr.com primary | CSC | udns1.cscdns.net udns2.cscdns.uk | 2 | 0 |
CDN & Security
CDN & Security, traffic-weighted: Builders FirstSource
CDN & security by hostname count: Builders FirstSource
Hostname map
The live hostnames from the table below, grouped by the provider in front of it and the network (ASN and BGP prefix) its address belongs to. Colored borders mark roles: primary site login / account store developer / API marketing / support / downloads.
Key hostnames by role (CDN & security)
- primary site: Azure
- login / SSO: none found
- account: none found
- store / checkout: none found
- marketing / brand: none found
- support / help: none found
- developer / API: none found
- downloads / static: none found
Hostnames (2)
Found through brand research, browser traffic data (Chrome UX Report) and certificate logs. Tiers: primary = bldr.com and www; key = customer-facing or revenue names (login, account, store, marketing/brand, support, developer, downloads) on any owned domain; other = remaining public names (low weight); internal = staff-only names, not listed here and not counted in share. "CDN & Security" is the CDN, WAF or cloud load balancer a visitor connects to first. Grey rows did not resolve. Weight = share of the company's traffic-weighted total.
| Hostname | Tier / role | DNS | CDN & security | CDN & security evidence | CNAME / IP · ASN | Weight |
|---|---|---|---|---|---|---|
| www.bldr.com CrUX top 500,000 | primary primary site primary site · CDN & security Azure · DNS CSC · 66.7% |
CSC | Azure | Direct (Azure) (A 40.117.138.103 in published Azure ranges) | bldr.com AS8075 · 40.112.0.0/13 | 66.7% |
| bldr.com | primary primary site primary site · CDN & security Azure · DNS CSC · 33.3% |
CSC | Azure | Direct (Azure) (A 40.117.138.103 in published Azure ranges) | 40.117.138.103 AS8075 · 40.112.0.0/13 | 33.3% |
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History
Trend charts start once two weeks of history build up.
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