Speed Test (Down/Up)

Checking protocol…

Run QUIC test

Tests whether QUIC (HTTP/3) is allowed by checking the browser's resource timing protocol for a live request.

Requests flow

Total requests

0

Success with QUIC

0

Success with HTTP

0

Failed requests

0

Requests: 0 / 0 (0%)

Sent QUIC HTTP Failed

Log

Name

Type ALLAAAAACNAMEMXNSTXTSOASRV

DNS server Cloudflare (1.1.1.1) Google (8.8.8.8) Quad9 (9.9.9.9) OpenDNS (208.67.222.222) Custom DoH URL

Custom DNS-over-HTTPS URL

Lookup

DNS queries are executed from the Worker using DNS-over-HTTPS.

Result

Export CSV Copy Expand

IP or hostname

Lookup

Looks up ASN/ORG via a public IP-to-ASN database and resolves PTR via DNS-over-HTTPS.

Result

Export CSV Copy Expand

IP or hostname

Check lists

Checks common DNSBLs for the resolved IPv4 address (best effort).

Result

Copy Expand

IP or hostname

Lookup

Fetches public geolocation info for the target IP.

Result

URL

Check headers

Checks common security headers and summarizes missing items.

Result

Copy Expand

URL

View protocol

Shows your protocol/TLS to this Worker and a best-effort target response summary.

Result

Copy Expand

URL

Max hops 51015

Trace

Follows redirects (manual) and shows each hop.

Result

Copy Expand

Domain

Fetch certs

Pulls recent certificate issuances (best effort) from a public CT feed.

Result

Export CSV Copy Expand

Name

Type AAAAA

Check

Queries multiple public resolvers to show propagation differences.

Result

Export CSV Copy Expand

URL

Samples5102030

Interval (ms)

Run snapshot

Runs repeated HEAD probes from the edge and summarizes uptime and latency.

Result

Copy Expand

Base domain

Discover

Queries certificate transparency (crt.sh) and deduplicates subdomains. Results are best-effort and may be rate-limited.

Result

Export CSV Copy Expand

Domain or IPv4

Lookup

WHOIS results are fetched via RDAP from a public endpoint.

Raw JSON

Raw message headers

Analyze

Parses raw RFC 5322 headers locally in your browser. No data is sent to the Worker.

Domain

Timeout (ms)

DNS server CloudflareGoogleQuad9OpenDNSCustom DoH URL

Custom DNS-over-HTTPS URL

DKIM selector(s) (optional, comma-separated)

Resolve A/AAAA for MX hostsYesNo

Run MX Tools

Includes: MX, SPF, DMARC, DKIM selector discovery, MTA-STS, TLS-RPT, reverse DNS, SMTP port probe (HTTP-only), and DNSBL (best-effort, no API key).

Result

Domain

Check SPF/DMARC

Checks SPF and DMARC records and summarizes policy tags.

Result

Copy Expand

Microsoft Safe Links URL (or wrapped URL)

Decode

Decodes the url parameter (percent-decoded up to 3 times).

Result

decodedUrl

Copy

JSON

Pretty print

Formats JSON locally in your browser. No data is sent to the Worker.

Result

Copy Expand

Markdown

Live preview runs in your browser. No data is sent to the Worker.

Quick links grouped by type

Microsoft

• Azure PortalCloud
• Cloud AdminAdmin
• DefenderSecurity
• Exchange AdminEmail
• M365 AdminAdmin
• O365 ATPLegacy
• PurviewCompliance

Zscaler

• Config PortalConfig
• ToolsTools
• Trust PortalStatus
• Zscaler IPInfo
• ZuluPortal

Versant Health

• AbnormalEmail
• AxoniusAsset
• CrowdStrikeEDR
• GitHub EntDev
• ServiceNowITSM
• SnykAppSec
• SOC RadarIntel
• TaniumEndpoint
• VaronisDLP

DNS & Email

• DMARCianDMARC
• DNS CheckerDNS
• DNS DumpsterDNS
• MX SuperToolDNS
• MXToolboxEmail

Threat Intel

• AbuseIPDBIP
• OTXIntel
• ShodanSearch
• urlscanURL
• VirusTotalFiles

Web Tools

• Burp Suite CEProxy
• NmapScan
• SSL LabsTLS
• WebPageTestPerf
• WebSec AcademyLearn
• WiresharkPCAP

Cloudflare

• CF DashboardAdmin
• CF DocsDocs
• CF RadarIntel
• CF Speed TestSpeed

Links open in a new tab.

Download size1 MB5 MB10 MB25 MB50 MB100 MB200 MB500 MB

Upload size256 KB1 MB5 MB10 MB25 MB50 MB100 MB

Jitter samples0 (skip)102040

Start test

Measures latency, jitter, download, and upload between your browser and this Worker.

Speed test

0.0

Mbps

Idle

Ready

Ping

-

Jitter

-

Download

-

Upload

-

Packet loss

-

RTT range

-

Idle

Log

URL

MethodHEADGET

RedirectsFollowManual

Probe

Confirms HTTP(S) reachability from the Cloudflare edge with status, headers, redirects, and timing.

Result

Copy Expand

Hostname (public)

IP (optional)

Ignore mismatchNoYes

Run / Refresh

Always starts a fresh SSL Labs assessment, optionally pinned to a specific IP and mismatch setting, then polls until READY.

SSL Labs can only assess publicly reachable hosts and is rate-limited.

Hostname or public IPv4

Scan profile HTTP + HTTPS (80, 443) HTTP only (80) HTTPS only (443) Web alt (8080, 8443) SFTP/SSH (22) FTP (21) Mail (25, 110, 143, 465, 587, 993, 995) RDP (3389) Custom ports…

Custom ports (comma-separated)

Run port scan

This is an HTTP(S) port probe from the Cloudflare edge (not a raw TCP SYN scan). Non-HTTP services may report as closed/unknown.

Result

Copy Expand

Hostname

Size (bytes)

Count451020

Run ping

Reports edge → target HTTP timing (not ICMP).

Result

Copy Expand

IPv4 address

CIDR

Calculate

Client-side calculator. No data leaves your browser for this tab.

CIDR (IPv4)

Max IPs 2561024409665536

Expand

Expands IPv4 CIDR ranges locally. Large ranges are truncated to the max.

Result

Copy Expand

Client values from Cloudflare request context

Refresh

Most important for QUIC is httpProtocol (look for h3).