nrev

Cross-platform Network Mapper.
Designed to be used in network scan, mapping and probes.

Features

• Port Scan
• Host Scan
• Ping
• Traceroute
• Neighbor Discovery
• Subdomain scan

Supported platforms

• Linux
• macOS
• Windows

Installation

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/shellrow/nrev/releases/latest/download/nrev-installer.sh | sh

Install prebuilt binaries via powershell script

irm https://github.com/shellrow/nrev/releases/latest/download/nrev-installer.ps1 | iex

From Releases

You can download archives of precompiled binaries from the releases .

Cargo

If you have Rust and the Cargo package manager installed on your system, you can install (download and build) nrev with the following command:

cargo install nrev

Or you can use binstall for install nrev from github release.

cargo binstall nrev

Basic Usage

Port Scan Example

To scan the default 1000 ports on a target, simply specify the target (-s for service detection, -o for OS detection)

nrev port yourcorpone.com -s -o
nrev port 192.168.1.10 -s -o

Sub-commands and Options

Usage: nrev [OPTIONS] <COMMAND>

Commands:
  port       Scan ports on the target(s) (TCP/QUIC)
  host       Discover alive hosts (ICMP/UDP/TCP etc.)
  ping       Simple ping (ICMP/UDP/TCP)
  trace      Traceroute (UDP)
  nei        Neighbor discovery (ARP/NDP)
  domain     Subdomain enumeration
  interface  Show network interface(s)
  help       Print this message or the help of the given subcommand(s)

Options:
      --log-level <LOG_LEVEL>  Global log level [default: info] [possible values: error, warn, info, debug, trace]
      --log-file               Log to file (in addition to stdout)
      --log-file-path <FILE>   Log file path (default: ~/.nrev/logs/nrev.log)
      --quiet                  Suppress all log output (only errors are shown)
  -o, --output <FILE>          Save output to file (JSON format)
      --no-stdout              Suppress stdout console output (only save to file if -o is set)
  -h, --help                   Print help
  -V, --version                Print version

See nrev <sub-command> -h for more detail.

Examples

Port scan

Scan default 1000 ports and enable service and OS detection for open ports

nrev port yourcorpone.com -s -o

Specify the ports

nrev port yourcorpone.com --ports 22,80,443,5000,8080

Specify the range

nrev port yourcorpone.com --ports 20-100

Settings

By default, nrev determines the connection timeout or waiting time until packet reception (before concluding the scan task) based on the results of the initial PING.
The initial PING is executed in the order of ICMP Ping, UDP Ping, TCP Ping, and if successful, proceeds to the next scan task.
If all PING attempts fail, nrev exits before executing the scan. This step can be skipped by setting the --noping flag.
For other settings, please refer to nrev port -h for details.

Host scan

ICMP Host scan

nrev host 192.168.1.0/24

nrev host /path/to/list/hostlist.txt

TCP Host scan

nrev host 192.168.1.0/24 --proto tcp --ports 80

Ping

Default ICMP Ping

nrev ping 1.1.1.1 -c 4

UDP Ping

nrev ping 1.1.1.1 --proto udp

TCP Ping

nrev ping 1.1.1.1 --proto tcp --port 80

Traceroute

UDP Trace

nrev trace 8.8.8.8

You can specify the interval in milliseconds for faster trace.

nrev trace 8.8.8.8 --interval-ms 500

Subdomain scan

nrev subdomain yourcorpone.com --wordlist /path/to/wordlist/top-1000.txt

Neighbor (ARP/NDP)

nrev nei 192.168.1.1

Specify the network interface

nrev port 10.10.11.14 --interface tun0

Privileges

nrev uses a raw socket which require elevated privileges. Execute with administrator privileges.

Note for Linux Users

nrev requires elevated privileges to send/receive raw-packet. On Linux, you can configure these privileges using two main methods:

1. Using setcap

Granting capabilities to the nrev binary allows it to operate with the necessary privileges without requiring sudo for each execution.
This method is recommended for single-user machines or in environments where all users are trusted.

Assign necessary capabilities to the nrev binary

sudo setcap 'cap_sys_ptrace,cap_dac_read_search,cap_net_raw,cap_net_admin+ep' $(command -v nrev)

Run nrev as an unprivileged user:

nrev

Capabilities Explained:

• cap_sys_ptrace,cap_dac_read_search: Allows nrev to access /proc/<pid>/fd/ to identify which open port belongs to which process.
• cap_net_raw,cap_net_admin: Enables packet capturing capabilities.

2. Using sudo (for multi-user environments)

For environments with multiple users, requiring privilege escalation each time nrev is run can enhance security.

sudo nrev

Note for macOS Users

On macOS, managing access to the Berkeley Packet Filter (BPF) devices is necessary for nrev to send/receive raw-packet Alternatively, of course, you can also use sudo to temporarily grant the necessary permissions.

Install chmod-bpf to automatically manage permissions for BPF devices:

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/shellrow/chmod-bpf/releases/latest/download/chmod-bpf-installer.sh | sh

Install prebuilt binaries via Homebrew

brew install shellrow/tap-chmod-bpf/chmod-bpf

Check BPF device permissions

chmod-bpf check

Install the chmod-bpf daemon to automatically manage BPF device permissions

sudo chmod-bpf install

Note for Windows Users

• Ensure that you have Npcap installed, which is necessary for nrev to send/receive raw-packet on Windows
• Download and install Npcap from Npcap. Choose the "Install Npcap in WinPcap API-compatible Mode" during installation.
• Build Dependencies:
  • Place the Packet.lib file from the Npcap SDK or WinPcap Developers pack in a directory named lib at the root of this repository.
  • You can use any of the locations listed in the %LIB% or $Env:LIB environment variables.
  • For the 64-bit toolchain, the Packet.lib is located in /Lib/x64/Packet.lib.
  • For the 32-bit toolchain, the Packet.lib is located in /Lib/Packet.lib.