Network tools.Developer tools.
Find the right network check, web diagnostic, or developer utility and get a clear result in seconds.
No sign-up · Browser-ready tools stay local · Live diagnostics run through a restricted same-origin API
Networking tools
Diagnose hosts, domains, routes, certificates, and the web layer.
Connectivity
Test reachability, stability, routes, uptime, and public ports.
Browser Latency Test
Measure this browser's latency to buffer.lol.
Connection Stability Test
Sample this browser's connection stability to buffer.lol.
Traceroute Visualizer
Trace hops from buffer.lol's diagnostics server to a destination.
Website Uptime Checker
Check reachability, response status, and timing on demand.
Port Checker
Test whether a public TCP port is reachable from the internet.
DNS & email
Inspect records, compare resolvers, and validate mail configuration.
DNS Lookup
Inspect A, AAAA, MX, TXT, CNAME, and NS records.
DNS Resolver Comparison
Compare normalized DNS answers from four public recursive resolvers.
Email DNS Health
Validate published MX, SPF, DMARC, DKIM, MTA-STS, and TLS reporting records.
WHOIS Lookup
Look up domain registration, registrar, nameserver, and expiry details.
Web & security
Review certificates, redirects, response metadata, and browser protections.
HTTP Header Inspector
See response headers, redirects, caching, and server details.
SSL Certificate Checker
Review certificate validity, issuer, names, and expiry.
Redirect Checker
Follow redirects and inspect status codes, locations, and timing.
Robots.txt / Sitemap Checker
Inspect robots.txt rules and discover sitemap declarations for a website.
HTTP Security Headers
Review transport and browser security headers with actionable recommendations.
Addressing
Calculate IPv4 networks, ranges, masks, and host counts locally.
IP tools
Understand your public network identity and browser environment.
What's My IP
See the public IP address exposed by your connection.
IP Network Lookup
Inspect the country, registered network, and ASN for a public IP.
ASN / ISP Lookup
Find the autonomous system and provider behind an IP.
User Agent Parser
Inspect this browser's user agent and platform signals.
Developer tools
Small, private utilities that run directly inside your browser.
JSON Formatter
Validate, format, and minify JSON without sending it anywhere.
Base64 Encoder / Decoder
Encode UTF-8 text to Base64 or decode it in your browser.
Hash Generator
Generate SHA-256, SHA-384, or SHA-512 digests locally.
UUID Generator
Create one or more RFC 4122 version 4 identifiers.
Timestamp Converter
Convert Unix timestamps and readable dates in either direction.
URL Parser / Encoder
Parse URLs, inspect query parameters, and encode or decode URL components locally.
JWT Decoder
Decode JWT headers and payloads locally without verifying signatures.
Regex Tester
Test JavaScript regular expressions and inspect matches, groups, and indexes.