High-Speed Web-based Traffic Analysis and Flow Collection

ntopng User Interface

ntopng is the next generation version of the original ntop, a network traffic probe that monitors network usage. ntopng is based on libpcap and it has been written in a portable way in order to virtually run on every Unix platform, MacOSX and on Windows as well.

ntopng – yes, it’s all lowercase – provides a intuitive, encrypted web user interface for the exploration of realtime and historical traffic information.

Main Features

  • Sort network traffic according to many criteria including IP address, port, L7 protocol, throughput, Autonomous Systems (ASs)
  • Show realtime network traffic and active hosts
  • Produce long-term reports for several network metrics including throughput and application protocols
  • Top talkers (senders/receivers), top ASs, top L7 applications
  • Monitor and report live throughput, network and application latencies, Round Trip Time (RTT), TCP statistics (retransmissions, out of order packets, packet lost), and bytes and packets transmitted
  • Store on disk persistent traffic statistics to allow future explorations and post-mortem analyses
  • Geolocate and overlay hosts in a geographical map
  • Discover application protocols (Facebook, YouTube, BitTorrent, etc) by leveraging on nDPI, ntop Deep Packet Inspection (DPI) technology
  • Characterise HTTP traffic by leveraging on characterisation services provided by Google and HTTP Blacklist.
  • Analyse IP traffic and sort it according to the source/destination.
  • Report IP protocol usage sorted by protocol type
  • Produce HTML5/AJAX network traffic statistics.
  • Full support for IPv4 and IPv6
  • Full Layer-2 support (including ARP statistics)
  • GTP/GRE detunnelling
  • Support for MySQL, ElasticSearch and LogStash export of monitored data
  • Interactive historical exploration of monitored data exported to MySQL
  • Alerts engine to capture anomalous and suspicious hosts
  • SNMP v1/v2c support and continuous monitoring of SNMP devices
  • Identity Management, including correlation of VPN users to traffic

Tech Specs

  • Unix (including Linux, *BSD, and MacOSX)
  • Windows x64 (including the latest Windows 10)
  • ARM
  • Available through any HTML5-ready web browser
  • SSL/HTTPS support
  • Memory Usage
    It depends on the ntop configuration, number of hosts, and number of active TCP sessions. In general it ranges from a few MB (little LAN) to 100 MB for a WAN.
  • CPU Usage
    It depends on the ntop configuration, and traffic conditions. On a modern PC and large LAN, it is less than 10% of overall CPU load.
  • Ethernet
  • IPv4/IPv6
  • GRE
  • 250+ Layer-7  application protocols supported by nDPI
  • …and many more
  • LUA scriptability
  • Web interface extensions without having to change the ntopng C++ engine.
Additional Features
  • sFlow, NetFlow (including v5 and v9) and IPFIX support through nProbe (collection from multiple nProbes is supported)
  • Internet Domain, AS (Autonomous Systems), VLAN (Virtual LAN) Statistics.
  • Protocol decoders for all application protocols supported by nDPI.

Available Versions

ntopng comes in four versions, Community, Professional, Enterprise M, Enterprise L. The Community version is free to use and opensource (code can be found on Github). The Professional and Enterprise offer some extra features that are particularly useful for SMEs or larger organizations. Features are highlighted in the following table.


Feature Community Pro Enterprise M Enterprise L
Monitor the active flows and hosts of your network †
Identity application protocols (Facebook, Youtube, BitTorrent, etc) in the network
Record and Visualize hosts’ historical applications protocols usage
Group hosts by VLAN, Operating System, Country, and Autonomous Systems
Get a geographic map of your network communications with the rest of the world
Identify top talkers (senders and receivers) hosts with minute resolution
Visualize the top HTTP sites contacted by an host
Export expired flows information to MySQL, possibly augmented with nProbe data
Generate alerts when hosts cross configurable time/traffic thresholds or have suspicious behaviours
Get alerts notifications as Slack messages
Split, merge, and visualize VLAN based traffic
Collect data from nProbe to treat remote nProbe-monitored interfaces and flow exporter devices (for example routers and switches) as if they were local
Split, merge, and visualize data collected from nProbe
Group local hosts into logical sets of IP and MAC addresses known as host pools ††
Get a realtime view of top talkers and application protocols and compare them with daily activities
Explore recorded MySQL data to identify the cause of network problems
Generate graphical reports with top hosts, application protocols, countries, networks, and autonomous systems within any configurable time frame
Mark and historicise traffic with user-defined traffic profiles to match hosts, ports and applications using the BPF syntax ‡
Limit or block your hosts’ traffic with customized per-protocol policies *
Integrate ntopng login with LDAP authentication servers *
Send ntopng generated alerts to nagios *
Query SNMP devices data, such as port status, traffic and and MAC address information
Advanced MySQL insertions yielding 5x faster database writes
Optimized MySQL aggregations for faster historical flow data explorations
Get total traffic and activity reports for any given host, network, or interface
Identify attackers and victims through an alerts dashboard in realtime and in the past
Visualize host pools’ historical applications protocols usage
Explore and filter flow alerts in the past
Visualize and historicise SNMP per-device-port traffic
Visualize and historicise NetFlow/sFlow devices data
Apply per-protocol daily traffic and time quotas to your clients *
High Performance Embedded Flow Index * †††
Continuous Traffic Recording *
Custom Interface Disaggregation
Identity Management
Continuous Recording license Included (n2disk 1Gbit)
Flow Collection license Included (nProbe Pro)
* Feature not available on Windows
† The Enterprise version allows the simultaneous monitoring of up to 128 different network interfaces. Professional and Community versions allows the monitoring of up to 32 different interfaces.
†† The Enterprise version allows the creation of up to 128 different host pools with an unlimited number of pool members. Professional and Community versions allow the creation of up to 3 different host pools with a maximum of 8 members per pool.
‡ The Enterprise version allows the creation of up to 128 different traffic profiles. The Professional version allows the creation of up to 16 traffic profiles.
††† Max 3 days retention on Pro, unlimited retention on Enterprise

All versions are meant to be used on a “full-fledged PC” such as an x86 machine. Users who plan to install ntopng on embedded devices, should consider using the embedded packages available for ARM.

Use Cases

Monitor a Physical Interface

A physical NIC card can be monitored simply by specifying its interface name as

ntopng -i eth0

Flow Collection

Flow collection requires ntopng to be used in conjunction with nProbe which can act as probe/proxy. The communication between nProbe and ntopng takes place over ZeroMQ, a publish-subscribe protocol that allows ntopng to communicate with nProbe. An environment where a remote nProbe is physically monitoring from a NIC and sending monitored flows to ntopng can be deployed as

nprobe -i eth1 --zmq tcp:// -T @NTOPNG@

ntopng -i tcp://

In this configuration ntopng is able to process more than 100’000 flows/second on an Intel Xeon E3-1230 v3 3GHz (note: ntopng and nProbe are running on different hosts, running both on the same host could lead to performance degradation).


ntopng Community is distributed under the GNU GPLv3 license. Professional and Enterprise versions are subject to the EULA terms as well.
Enterprise L version already includes n2disk 1 Gbit (Continuous Recording) and nProbe Pro (Flow Collection) licenses.

 Get It

Have a look at the download page for installation instructions and at the shop if you are considering to get a license. As all the other ntop products, a licensed ntopng includes installation support.