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ZMap: The Internet Scanner

Build Status

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 in under 45 minutes. With a 10gigE connection and 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, ZMap's sister project that performs stateful application-layer handshakes.


The latest stable release of ZMap is version 2.1.1 and supports Linux, macOS, and BSD. We recommend installing ZMap from HEAD rather than using a distro package manager.

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


A guide to using ZMap is found in our GitHub Wiki.

IPv6 support

We added IPv6 support to ZMap and include the following new probe modules:

  • ICMPv6 Echo Request: icmp6_echoscan
  • IPv6 TCP SYN (any port): ipv6_tcp_synscan or ipv6_tcp_synopt
  • IPV6 UDP (any port and payload): ipv6_udp

You can specify the respective IPv6 probe module using the -M or --probe-module command line flag.

In addition, you need to specify the source IPv6 address with the --ipv6-source-ip flag and a file containing IPv6 targets using the --ipv6-target-file flag. More information can be found using the --help flag.

As targets for your IPv6 measurements you can e.g. use addresses from our IPv6 Hitlist Service.

License and Copyright

ZMap Copyright 2017 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

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.