Linux Network Scanning with Python: Ping Sweep & Port Scan (2026 Guide)

Network scanning is a fundamental skill for both sysadmins and security professionals. Whether you're inventorying devices on your network, checking which services are running on a server, or performing a security assessment, you need reliable scanning tools.

While nmap is the gold standard, it's not always available — many minimal server installations don't include it, and installing additional packages on production systems requires change management approval. dargslan-net-scanner provides essential network scanning capabilities using only Python's standard library.

Installing dargslan-net-scanner

pip install dargslan-net-scanner

# Or install the complete 15-tool toolkit
pip install dargslan-toolkit

CLI Usage

# Ping sweep — discover live hosts
dargslan-netscan ping 192.168.1.0/24

# Port scan a specific host
dargslan-netscan ports 192.168.1.1

# Scan specific ports only
dargslan-netscan ports 192.168.1.1 -p 22,80,443,3306,5432

# Scan a port range
dargslan-netscan ports 192.168.1.1 -p 1-1024

# Network sweep with port check
dargslan-netscan sweep 10.0.0.0/24

# Host information
dargslan-netscan info 192.168.1.1

# JSON output
dargslan-netscan json 192.168.1.0/24

Python API

from dargslan_net_scanner import NetScanner

ns = NetScanner(timeout=2)

# Discover live hosts on a subnet
alive = ns.ping_sweep("192.168.1.0/24")
print(f"Found {len(alive)} live hosts:")
for host in alive:
    print(f"  {host['ip']:16s} RTT: {host['rtt_ms']:.1f}ms")

# Port scan a specific host
ports = ns.port_scan("192.168.1.1")
for p in ports:
    if p['open']:
        service = p.get('service', 'unknown')
        print(f"  Port {p['port']:>5}: OPEN ({service})")

# Scan specific ports
ports = ns.port_scan("192.168.1.1", ports=[22, 80, 443, 3306, 5432, 6379, 8080])
open_ports = [p for p in ports if p['open']]
print(f"Open ports: {', '.join(str(p['port']) for p in open_ports)}")

# Host information
info = ns.host_info("192.168.1.1")
print(f"Hostname: {info.get('hostname', 'N/A')}")
print(f"Reachable: {info['reachable']}")

# Full network report
report = ns.network_report("192.168.1.0/24", common_ports=True)
for host in report:
    ports_str = ", ".join(str(p) for p in host['open_ports'])
    print(f"  {host['ip']:16s} Ports: {ports_str or 'none'}")

Understanding Network Scanning

Ping Sweep (Host Discovery)

A ping sweep sends ICMP echo requests to every IP in a subnet to find which hosts are alive. It's the fastest way to inventory a network.

# Manual ping sweep
for ip in $(seq 1 254); do
    ping -c 1 -W 1 192.168.1.$ip &>/dev/null && echo "192.168.1.$ip is alive" &
done
wait

# Using nmap
nmap -sn 192.168.1.0/24

# Using fping (faster)
fping -a -g 192.168.1.0/24 2>/dev/null

Port Scanning

Port scanning connects to TCP ports to determine which services are listening. Each open port represents a running service.

# Using netcat
nc -zv 192.168.1.1 22
nc -zv 192.168.1.1 1-1024

# Using nmap
nmap -p 22,80,443 192.168.1.1
nmap -p- 192.168.1.1           # All 65535 ports
nmap -sV 192.168.1.1           # Service version detection

# Using bash
(echo >/dev/tcp/192.168.1.1/22) 2>/dev/null && echo "Port 22 open"

Common Service Ports

Network Troubleshooting Commands

# IP address and interface info
ip addr show
ip link show
ip route show

# DNS resolution
dig example.com
nslookup example.com
host example.com

# Traceroute
traceroute example.com
mtr example.com          # Interactive traceroute + ping

# ARP table (local network)
ip neigh show
arp -a

# Connection tracking
ss -tnp                  # TCP connections
ss -tlnp                 # Listening ports
conntrack -L             # Connection tracking table

# Bandwidth testing
iperf3 -c server-ip      # Client mode
iperf3 -s                # Server mode

Automated Network Monitoring

#!/usr/bin/env python3
# /opt/scripts/network-scan.py
from dargslan_net_scanner import NetScanner

EXPECTED_HOSTS = ["192.168.1.1", "192.168.1.10", "192.168.1.20"]
CRITICAL_PORTS = {
    "192.168.1.10": [22, 80, 443],
    "192.168.1.20": [22, 5432],
}

ns = NetScanner(timeout=3)

# Check expected hosts are alive
alive_ips = [h['ip'] for h in ns.ping_sweep("192.168.1.0/24")]
for host in EXPECTED_HOSTS:
    if host not in alive_ips:
        print(f"ALERT: {host} is DOWN!")

# Check critical ports
for host, ports in CRITICAL_PORTS.items():
    results = ns.port_scan(host, ports=ports)
    for p in results:
        if not p['open']:
            print(f"ALERT: {host}:{p['port']} is CLOSED!")

Network scanning is your eyes on the network. dargslan-net-scanner provides essential ping sweep and port scanning capabilities without requiring nmap or any external tools — just Python.

Install now: pip install dargslan-net-scanner — or get all 15 tools: pip install dargslan-toolkit

Download our free Network Scanner Cheat Sheet for quick reference.