System Administration & Network Diagnostic Tools

Browser-based operational checks for DNS, SSL/TLS, email authentication, WHOIS, IP and ASN data, blacklist status, port reachability, and HTTP headers. Built for sysadmins, hosting engineers, DevOps, SREs, developers, and IT support teams.

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Operational checks

On-demand browser checks for DNS, TLS, mail, IP, HTTP, and reachability troubleshooting.

Result interpretation

Results can vary by resolver cache, network path, source IP, CDN/proxy behavior, registry data, and blacklist provider.

Observable signals only

The tools report protocol responses and externally visible signals, not hidden internal server state.

Common infrastructure checks

Start with the workflow that matches the incident, deployment change, or configuration review.

DNS propagation after record changes SSL/TLS certificate chain review SPF/DKIM/DMARC check IP/ASN lookup Blacklist check HTTP header inspection SMTP connectivity test Port reachability check
Network Tools
8 tools

DNS Lookup

Query A, AAAA, MX, TXT, CNAME, NS, and other DNS records.

Network

Reverse DNS

Resolve PTR records and map IP addresses back to hostnames.

Network

DNS Propagation

Compare DNS answers across recursive resolvers after record changes.

Network

Ping Test

Check host reachability and latency from the OpsCheck server.

Network

Port Scanner

Check selected TCP ports for reachability from this server.

Network

IP Geolocation

Look up approximate IP location, ASN, ISP, and network ownership data.

Network

IPv6 Tools

Expand, compress, and inspect IPv6 addresses for troubleshooting.

Network

Subnet Calculator

Calculate CIDR ranges, usable hosts, broadcast address, and subnet details.

Network
Security Tools
7 tools

SSL Certificate Checker

Inspect certificate validity, issuer, SANs, expiry, and chain details.

Security

SSL Decoder

Decode certificate contents and inspect subject, issuer, SANs, and validity dates.

Security

TLS Scanner

Inspect supported TLS versions, cipher suites, and certificate configuration.

Security

Password Strength Checker

Evaluate password length, entropy indicators, and common weakness patterns.

Security

Blacklist Checker

Check whether an IP address or domain appears on common DNSBL and mail reputation blocklists.

Security

Package Vulnerability Check

Check package names and versions against available vulnerability data.

Security

SBOM Vulnerability Scanner

Review SBOM package entries against available vulnerability data.

Security
Email Tools
5 tools

Email Authentication

Check SPF, DKIM, and DMARC DNS records for mail authentication alignment.

Email

SMTP Tester

Test SMTP connectivity, banner response, and STARTTLS support.

Email

SPF Flattener

Inspect SPF include chains and generate a flattened SPF record candidate.

Email

Email Header Analyzer

Parse message headers to review routing, authentication, and delivery signals.

Email

SPF & DMARC Generator

Generate baseline SPF and DMARC DNS records for common mail setups.

Email
Utility Tools
12 tools

WHOIS Lookup

Look up domain registration, registrar, nameserver, and RDAP/WHOIS data.

Utility

Base64 Encoder/Decoder

Encode and decode Base64 strings for transport and configuration checks.

Utility

Hash Generator

Generate common hashes for checksums, identifiers, and comparison workflows.

Utility

HTTP Headers

Inspect redirects, cache headers, security headers, and server response metadata.

Utility

URL Encoder/Decoder

Encode and decode URL components for logs, redirects, and query strings.

Utility

JSON Formatter

Format, validate, and inspect JSON payloads and configuration snippets.

Utility

Timestamp Converter

Convert Unix timestamps and date formats for logs and incident timelines.

Utility

User Agent Parser

Parse user-agent strings to identify client, browser, OS, and device signals.

Utility

MAC Vendor Lookup

Look up vendor prefixes from MAC addresses for network inventory checks.

Utility

JavaScript Minifier

Minify or beautify JavaScript snippets for inspection and deployment prep.

Utility

HTML Minifier

Minify or beautify HTML markup for inspection and deployment prep.

Utility

CSS Minifier

Minify or beautify CSS code for inspection and deployment prep.

Utility