ZMap is a fast single packet network scanner designed for Internet-wide network surveys. On a typical desktop computer with a gigabit Ethernet connection, ZMap is capable scanning the entire public IPv4 address space on a single port in under 45 minutes. With a 10gigE connection and netmap or PF_RING, ZMap can scan the IPv4 address space in under 5 minutes.

ZMap operates on GNU/Linux, Mac OS, and BSD. ZMap currently has fully implemented probe modules for TCP SYN scans, ICMP, DNS queries, UPnP, BACNET, and can send a large number of UDP probes. If you are looking to do more involved scans (e.g., banner grab or TLS handshake), take a look at ZGrab 2, ZMap's sister project that performs stateful application-layer handshakes.

If you haven't used ZMap before, we have a step-by-step Getting Started Guide that details how to perform basic scans. Documentation about all of ZMap's options and more advanced functionality can be found in our GitHub Wiki.

If you have questions, please first check our FAQ. Still have questions? Ask the community in Github Discussions. Please do not create an Issue for usage or support questions.

The latest stable release of ZMap is version 4.1.1 and supports Linux, macOS, and BSD.

Instructions on building ZMap from source can be found in INSTALL.

More information about ZMap's architecture and a comparison with other tools can be found in these two research papers:

• ZMap: Fast Internet-Wide Scanning and its Security Applications
• Zippier ZMap: Internet-Wide Scanning at 10 Gbps

If you use ZMap for published research, please cite the original research paper:

@inproceedings{durumeric2013zmap,
  title={{ZMap}: Fast Internet-wide scanning and its security applications},
  author={Durumeric, Zakir and Wustrow, Eric and Halderman, J Alex},
  booktitle={22nd USENIX Security Symposium},
  year={2013}
}

Citing the ZMap paper helps us to track ZMap usage within the research community and to pursue funding for continued development.

ZMap Copyright 2023 Regents of the University of Michigan

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See LICENSE for the specific language governing permissions and limitations under the License.