ZMap review
A powerful CLI for large-scale IPv4 probing, without deeper service detection.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
ZMap is an open-source, command-line network scanner for researchers conducting large-scale Internet surveys. It can probe public IPv4 space or selected IP addresses, hostnames, CIDR ranges, and port ranges with stateless, single-packet scans. Its focus is network-layer discovery: identifying responsive hosts rather than collecting deeper service details. ZMap runs on Linux and macOS, with the project description also noting BSD support.
The scanner's main strength is control over large probing jobs. Users can select TCP SYN, ICMP, DNS, UPnP, BACnet, or UDP modules, set scan-rate and bandwidth limits, and apply allowlists or blocklists. Custom probe and output modules extend the tool beyond its included options. Output filtering and configurable fields help shape results for analysis, while CSV, JSON, and text-oriented formats support common research workflows. Multiple ZMap instances can also shard a scan across separate workloads.
ZMap is free and open source, with a command-line deployment model rather than hosted plans. That makes it a fit for researchers who need direct control over Internet-wide IPv4 measurement and can work with CLI-based tooling. It is less suitable for teams seeking a graphical scanner, managed service, or built-in service and banner identification. For deeper service handshakes and banner collection, the related ZGrab2 project is the intended companion, so buyers focused on service-level results should account for that additional tool in their workflow.
ZMap pros and cons
- Where it wins
- Internet-wide public IPv4 scanning with configurable rates and bandwidth
- Multiple TCP, ICMP, DNS, UPnP, BACnet, and UDP probe modules
- Custom modules, sharding, filtering, and CSV, JSON, or text outputs
- Where it doesn't
- Command-line deployment requires Linux or macOS
- Focuses on responsive hosts rather than service identification
- Designed for research and measurement, not a hosted commercial workflow
ZMap fact sheet, pricing and score →
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