Free Network Tools — DNS, SSL, IP Lookup & Diagnostics
Network Tools on Apex Toolz help developers, IT staff, and site owners diagnose connectivity, DNS, TLS certificates, and HTTP behavior without installing CLI utilities on locked-down laptops.
About this category
DNS Lookup returns A, AAAA, CNAME, MX, and TXT records for mail and hosting verification. WHOIS and IP Lookup support domain research and abuse triage. SSL Checker inspects certificate expiry and chain issues before browsers show warnings.
Ping Test and Traceroute map latency and hop paths when users report slow or unreachable hosts. Port Checker probes TCP ports for firewall validation. HTTP Header Checker and Redirect Checker debug CDN caching, security headers, and redirect chains up to ten hops.
Some network queries require server-side fetches to authoritative systems — unlike Image Tools, DNS and WHOIS cannot run entirely inside your browser sandbox. Apex Toolz performs these lookups when you submit a hostname or URL; we do not store your query history in marketing databases.
Featured tools below cover the most common triage steps after a deploy or support ticket.
Hybrid cloud architectures split blame between DNS, CDN, origin, and application layers — Network Tools help isolate the network half before engineers profile database queries.
Compliance audits sometimes require evidence of TLS versions and redirect behavior — export checker results into change tickets for SOC2-style paper trails.
Multi-region deployments should DNS Lookup from external perspective after geo-routing changes — what resolves in US-East may differ from EU resolver caches until TTL expires.
Why use these tools
Email deliverability failures often trace to missing MX or SPF TXT records — DNS Lookup confirms propagation faster than guessing.
Certificate expiry outages are preventable — SSL Checker before go-live catches mismatched hostnames and weak chains.
Redirect loops after marketing URL changes surface instantly in Redirect Checker instead of manual curl loops.
Support tickets with “site is down for me” need ping and traceroute evidence before blaming application code.
WHOIS lookups help distinguish registrar expiry from hosting outages when a domain suddenly stops resolving.
HTTP Header Checker surfaces HSTS, CSP, and cache-control mistakes that SSL Checker alone will not reveal.
Featured tools
DNS Lookup
Look up A, AAAA, CNAME, MX, and TXT DNS records for any domain.
SSL Checker
Inspect SSL/TLS certificate validity, issuer, and expiry for any domain.
WHOIS
Query WHOIS registration data for domains and IP address blocks.
IP Lookup
Look up geolocation, ISP, and network details for any IP address.
Ping Test
Test network reachability and latency to a host with ping diagnostics.
Redirect Checker
Trace redirect chains and final destination for any URL.
HTTP Headers
Fetch and inspect HTTP response headers for any public URL.
Port Checker
Check whether a TCP port is open on a remote host or IP address.
Tool categories
DNS & WHOIS
Records, registration, and IP geolocation
SSL & HTTP
Certificates, headers, and redirects
Common workflows
New domain go-live
Verify DNS and TLS before announcing launch.
- 1Confirm A/AAAA records point to expected host with DNS Lookup.
- 2Validate MX and TXT for mail and verification tokens.
- 3Run SSL Checker on HTTPS URL — fix expiry or hostname mismatch.
- 4Fetch HTTP headers to confirm CDN and security headers.
- 5Test redirect from apex to www with Redirect Checker.
Email not arriving
Mail routing and SPF/DKIM sanity check.
- 1Inspect MX records in DNS Lookup — priority order matters.
- 2Review TXT for SPF, DKIM, and DMARC entries.
- 3Confirm recent DNS changes propagated (TTL aware).
- 4Check sending domain SSL only if submission uses HTTPS APIs.
- 5Escalate to mail provider with DNS screenshot attachments.
Slow API for remote users
Separate network from application latency.
- 1Ping Test host from your location for baseline RTT.
- 2Traceroute to find congested hops toward destination region.
- 3Compare SSL and HTTP timing with Header Checker TTFB hints.
- 4Run Browser Speed Test on client side to rule out local Wi-Fi.
- 5Share traceroute output with hosting provider if path issue.
CDN cutover verification
After pointing DNS to new edge provider.
- 1Compare DNS A/AAAA before and after cutover with DNS Lookup.
- 2Fetch headers from apex and www — confirm CDN identifier changed.
- 3Run Redirect Checker on legacy CDN URLs still cached in marketing emails.
- 4SSL Checker on both hostnames — certificate must cover all SANs.
- 5Ping origin directly if provider documents bypass hostname for comparison.
Helpful tips
- DNS propagation may take up to TTL duration — retest after waiting, not every minute.
- WHOIS privacy masks registrant data — use registrar portal for ownership disputes.
- Port Checker results depend on remote firewalls — closed may be intentional security.
- Redirect Checker stops at ten hops — loops beyond that truncate with warning.
- Pair with Security Tools when rotating credentials after SSL or DNS hijack scares.
- Browser Tools include speed and device diagnostics for client-side half of issues.
- Document baseline DNS and SSL results after healthy deploy — diffing against baseline speeds incident triage.
- Internal hostnames on corporate VPN may resolve differently — test from external network when validating public go-live.
- Traceroute hop timeouts are normal — look for pattern breaks, not 100% response rate on every intermediate router.
Explore further
Related categories
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Frequently asked questions
Summary
Network Tools aggregate DNS, WHOIS, SSL, ping, traceroute, port, and HTTP utilities for deploy verification and support triage. Server-side lookups reach authoritative data your browser cannot query directly.
Use go-live, email, and latency workflows to structure investigations. Featured tools include DNS Lookup, SSL Checker, and Redirect Checker.
Related categories include Browser Tools for client connectivity tests, Security Tools for credential hygiene, and Developer Tools for URL parsing alongside redirect debugging.
Network diagnostics are episodic but high stakes — keep this category bookmarked for deploy nights and Monday-morning “email stopped working” reports so your first response is structured, not frantic tab sprawl.
IPv6 adoption means checking both A and AAAA records during cutovers — some clients prefer v6 paths while mail still relies on v4. DNS Lookup surfaces both families in one pass.
Certificate transparency logs lag real-time deploys — SSL Checker on live URL remains authoritative immediately after certbot or ACME renewal.
HTTP/3 and QUIC may bypass some legacy header expectations — compare Header Checker results across HTTP/1.1 and HTTP/2 if CDN supports both.
Split-horizon DNS causes “works on my machine” deploy bugs — compare office resolver vs public DNS Lookup after internal zone edits.