Mini Tools Collection
Useful one-page tools for real work
ToolPatch is a growing collection of focused utilities. Each page handles one task with clear inputs, fast results, and practical outputs.
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Network
Featured
CIDR Aggregator
Compute a covering supernet for multiple CIDR blocks.
Summarize multiple routes into a single supernet to simplify route tables and policy logic.
Network
Featured
DNS Lookup
Query DNS records by type for a host.
Lookup A, AAAA, CNAME, MX, TXT, and NS records from one page for fast diagnostics.
Network
Featured
DNS Propagation Checker
Check DNS record propagation across major public resolvers.
DNS Propagation Checker queries multiple public resolvers and shows what each one currently returns for a given record type. It helps you verify whether DNS changes are fully visible worldwide or still inconsistent across recursive DNS providers. You can optionally provide an expected value (for example an A record IP or TXT token) to measure match rate directly. This is useful during domain cutovers, mail authentication setup, and outage triage where stale resolver data causes mixed behavior. Results reflect resolver caches and query timing at the moment you run the check.
Network
Featured
DNS Record Builder
Generate valid DNS zone record lines for common record types.
Build A, AAAA, CNAME, MX, TXT, and SRV records quickly with syntax guidance and defaults.
Network
Featured
IP Classifier
Classify IPv4/IPv6 addresses by private, loopback, multicast, and more.
Instantly classify addresses for troubleshooting, security reviews, and docs validation.
Network
Featured
IP Lookup
Inspect IP type and reverse DNS details.
Look up IPv4/IPv6 properties including private/public class, loopback, multicast, and reverse DNS.
Network
Featured
MTU MSS Calculator
Calculate effective payload and TCP MSS from MTU and tunnel overhead.
Model encapsulation overhead across IPv4/IPv6 and common tunnels to prevent fragmentation issues.
Network
Featured
Packet Loss Impact Estimator
Estimate throughput degradation from loss and RTT assumptions.
Use a practical TCP-oriented rule-of-thumb model to quantify packet loss impact on effective throughput.
Network
Featured
Port Range Planner
Plan port ranges against concurrent session requirements.
Estimate whether a configured port interval can handle projected concurrency safely.
Network
Featured
Subnet Calculator
Calculate network, broadcast, host range, and mask details from CIDR.
Analyze IPv4 subnets quickly for network planning, lab setup, and infrastructure troubleshooting.
Network
Featured
Supernet Calculator
Find the smallest covering CIDR for an IPv4 start/end range.
Compute the minimal supernet that covers an address interval for route and ACL simplification.
Network
Featured
Throughput Unit Converter
Convert bps/Kbps/Mbps/Gbps and estimate transfer time.
Translate bandwidth units and estimate file transfer durations for operations and capacity planning.
Network
Featured
Uptime SLA Calculator
Translate SLA percentage targets into allowed downtime windows.
Compute maximum allowable downtime for day, week, month, or year across common uptime targets.
Network
Featured
VLSM Planner
Plan variable-length subnet allocations from a base CIDR.
Allocate host requirements into efficiently sized subnets and verify whether all requests fit in the parent block.
Network
Featured
What's My IP
Show the client IP address seen by the server.
Display the current request IP along with forwarded header hints for quick troubleshooting.
Network
IPv4 to Integer Converter
Convert IPv4 addresses to 32-bit integers and back.
Useful for database indexing, scripting, firewall rule systems, and low-level networking work.
Network
IPv6 Compressor Expander
Compress or fully expand IPv6 notation.
Normalize IPv6 addresses for documentation, automation pipelines, and compliance checks.
Network
Latency Budget Calculator
Allocate and track end-to-end latency budget across system components.
Break down response-time targets into frontend, backend, DB, network, and external dependency budgets.
Network
WHOIS Lookup
Fetch WHOIS registration data for domains.
Retrieve raw WHOIS output for domain ownership and registrar metadata checks.
Network
Wildcard Mask Calculator
Convert subnet masks into wildcard masks for ACL rules.
Generate wildcard masks and binary mask views for router and firewall ACL configuration.