Angry IP Scanner (or simply ipscan) is an open-source and cross-platform network scanner designed to be fast and simple to use. It scans IP addresses and ports as well as has many other features. It is widely used by network administrators and just curious users around the world, including large and small enterprises, banks, and government agencies. This command will scan your network from 192.168.0.1 to 255 and will display the hosts with their MAC address on your network. In case you want to display the mac address for a single client, use this command make sure you are on root or use 'sudo' sudo nmap -Pn 192.168.0.1 this command will display the host MAC address and the open ports.
Network scanning is a necessary task, but it can start off simple and rapidly become more complicated as your business gets larger. Manually finding IP addresses on your network is possible, but why do it yourself when there are so many tools to help you? Not only can network scanning tools help you find IP addresses, but they can also provide extra information for monitoring, troubleshooting, and keeping your network running efficiently.
My top choice for a network scanning tool is the SolarWinds® IP Address Manager, as it works in an intuitive and easy-to-use way while offering a broad suite of tools and functions. It’s more approachable than some of the other tools out there and has a flatter learning curve for figuring out how to get started.
MAC Address Scanner is a simple software utility which was developed specifically in order to help individuals scan all computers on their network or a host, in order to find out their MAC addresses. Download Colasoft MAC Scanner Colasoft MAC Scanner will send out ARP (Address Resolution Protocol) queries to the specified subnet and listen to the responses from all the hosts in the subnet, then list the MAC addresses and IP address in pairs.
How to Find IP Addresses of Devices on My Network
Curious how to find IP addresses on-network? You may need to know about either static or dynamic IP addresses. If you can access your router, you may be able to simply view the client lists and get information like hostname and MAC address. Or you can use a device connected to the network to ping the network and view the ARP tables. Done manually in this way, you have to do everything through the command line. Use the prompt “ipconfig” on Windows to get network settings, followed by “arp -a” to view IPs plus MAC addresses.
However, this method doesn’t work across subnets. This means that if you have multiple subnets on your network, you have to go through each individual router or subnet to determine the IP addresses within the subnet. It becomes pretty clear as your network scales, manually scanning for IP addresses becomes an extremely complex task. Multiple subnets and an ever-changing string of devices connecting to and disconnecting from the network becomes problematic.
Instead of attempting to manually manage these aspects of your network, I recommend using an IP address manager (IPAM). These tools help you to manage your IP addresses and troubleshoot problems, but they also help you to find all the IP addresses of the devices on your network and determine the status of each one (dynamic, static, available, reserved, etc.). Some tools will also integrate with DNS and DHCP, and all of them will usually present data in a visual, interactive format. Many also allow you to save your network scanning results and present them in spreadsheets or reports.
Best Network Scanner Tools 2020
SolarWinds IP Address Manager
This is my top choice for network scanning software. The SolarWinds IP Address Manager (IPAM) with its IP Address Scanner feature is great for both beginner users and small businesses, and expert network administrators and large enterprises. With automated IP address tracking and integrated DHCP and DNS management, you can quite easily monitor your IP addresses and associated network information.
You can also see all your subnets and how they are structured, and which subnets and scopes don’t have much free space remaining. It allows you to flag capacity issues before they become a problem so that IP address issues don’t affect performance. I’ve also found it’s easy to find unused IPs and reclaim them to tidy up my networks.
This IPAM uses a clean and simple interface, without a steep learning curve like some other IP address managers. You can easily assign management or control permissions to other admins or admin groups, allowing you to delegate tasks simply within the IPAM rather than needing to use another tool. The console is centralized, allowing you to see all the relevant information in one place, reducing the potential for error.
I consider the SolarWinds IPAM to be a complete solution, and it’s my choice for an all-round lightweight tool you can use to scan and maintain your network. There’s a free trial available so you can try it out, then level up to gain access to more features and greater scalability.
This is another strong business-level contender for network scanner tools. MyLanViewer is an IP and network scanner, as well as a traceroute tool and network monitor. It uses a buddy-list style window to display all of your network computers, including important technical information about each one. It can scan your network to monitor IPs and let you know when any details change. It also supports remote shutdown and other remote functions for each network computer. It can monitor hidden devices on your subnets and discover bottlenecks in your connection with its traceroute tool. I’d say this is a fine choice for business use—it has an easy-to-use interface and is suitable for beginners and advanced users.
Advanced IP Scanner - Download Free Network Scanner.
Angry IP Scanner
Looking for one of the best free tools? This is an open-source and free network scanning tool, with the ability to scan ports and IP addresses quickly and efficiently. The tool provides a report of data on each device on the network, including NetBIOS, MAC and IP address, computer name, and hostname. Keep in mind that open-source tools do require a bit more know-how on the user’s part and aren’t my usual pick for business use.
Angry IP Scanner can also produce reports in XML, CSV, and TXT format, which is useful for exporting data and other things within your business. Its unique feature is it uses a multi-threaded scanning approach, which uses a separate scanning thread for each IP address. This helps to improve the scanning process and make it more accurate.
Picking the Best IP Scanner
When I want to discover IP addresses on my network or scan for data generally, I tend to lean toward using a network scanning tool rather than trying to do it manually. Many network scanners have simple interfaces, and some go above and beyond in terms of ease-of-use and clean interface appearance. I like using the SolarWinds IP Address Manager, as it contains a pretty hefty solution in a lightweight package, with a free trial for people who want to try it out without commitment.
Ultimate Guide to Network Monitoring: If you’re looking for more in-depth information on how to monitor and look after your network, take a look here for a beginner’s guide followed by more expert-level instructions.
How would you communicate with a device when you don’t have the IP?
You might be in a situation where you don’t have the IP address of a device in a local network, but all you have is records of the MAC or hardware address.
Or your computer is unable to display its IP due to various reasons, and you are getting a “No Valid IP Address” error.
Finding the IP from a known MAC address should be the task of a ReverseARP application, the counterpart of ARP.
But RARP is an obsolete protocol with many disadvantages, so it was quickly replaced by other protocols like BOOTP and DHCP, which deal directly with IP addresses.
In this article, we’ll show you how to find IPs and device vendors using MAC addresses with different methods for free.
ARP (Address Resolution Protocol) is the protocol in charge of finding MAC addresses with IPs in local network segments.
It operates with frames on the data link layer.
As you might already know, devices in the data link layer depend on MAC addresses for their communication.
Their frames encapsulate packets that contain IP address information.
A device must know the destination MAC address to communicate locally through media types like Ethernet or Wifi, in layer 2 of the OSI model.
Understanding how ARP works can help you find IPs and MAC addresses quickly.
The following message flow diagram can help you understand the concept:
- The local computer sends a ping (ICMP echo request) to a destination IP address (remote computer) within the same segment. Unfortunately, the local computer does not know the MAC address… it only knows the IP address.
- The destination hardware address is unknown, so the ICMP echo request is put on hold. The local computer only knows its source/destination IP and its source MAC addresses. ARP uses two types of messages, ARP Request and Reply.
The local computer sends an ARP REQUEST message to find the owner of the IP address in question.
This message is sent to all devices within the same segment or LAN through a broadcast MAC (FF:FF:FF:FF:FF:FF) as the destination.
- Because the remote computer is part of the same network segment, it receives the broadcast message sent by the local computer. All other computers in the LAN also receive the broadcast but they know that the destination IP is not theirs, so they discard the packet. Only the remote computer with destination IP, responds to the ARP REQUEST with an ARP REPLY, which contains the target MAC address.
- The local computer receives the ARP REPLY with the MAC address. It then resumes the ICMP echo request, and finally, the remote computer responds with an ICMP echo reply.
Finding IPs with ARP
You can use ARP to obtain an IP from a known MAC address.
But first, it is important to update your local ARP table in order to get information from all devices in the network.
Send a ping (ICMP echo reply) to the entire LAN, to get all the MAC entries on the table.
Scan For Mac Address On Network Access
To ping the entire LAN, you can send a broadcast to your network.
Open the Command Prompt in Windows or terminal in macOS and type.
My subnet is 192.168.0.0/24 (mask of 255.255.255.0), so the broadcast address is 192.168.0.255 which can be calculated or found with a “Print Route” command in Windows or a “netstat -nr” in macOS. Or can also be obtained with a subnet calculator.
- Open the CMD (Command Prompt)
- Go to the “Start” menu and select “Run” or press (Windows key + R) to open the Run application
- In the “Open” textbox type “cmd” and press “Ok”.
This will open the command-line interface in Windows.
- Enter the “arp” command.
- The arp command without any additional arguments will give you a list of options that you can use.
- Use the arp with additional arguments to find the IP within the same network segment.
- With the command “arp -a” you can see the ARP table and its entries recently populated by your computer with the broadcast ping.
- Reading the output.
- The information displayed in the arp-a is basically the ARP table on your computer.
- It shows a list with IP addresses, their corresponding physical address (or MAC), and the type of allocation (dynamic or static).
Let’s say you have the MAC address 60-30-d4-76-b8-c8 (which is a macOS device) and you want to know the IP.
From the results shown above, you can map the MAC address to the IP address in the same line.
The IP Address is 192.168.0.102 (which is in the same network segment) belongs to 60-30-d4-76-b8-c8.
You can forget about those 224.0.0.x and 239.0.0.x addresses, as they are multicast IPs.
- Open the Terminal App. go to Applications > Utilities > Terminal or Launchpad > Other > Terminal.
- Enter the “arp” command with an “-a” flag.
- Once you enter the command “arp -a” you’ll receive a list with all ARP entries to the ARP Table in your computer.
- The output will show a line with the IP address followed by the MAC address, the interface, and the allocation type (dynamic/static).
Finding IPs with the DHCP Server
The Dynamic Host Configuration Protocol (DHCP) is the network protocol used by TCP/IP to dynamically allocate IP addresses and other characteristics to devices in a network.
The DHCP works with a client/server mode.
The DHCP server is the device in charge of assigning IP addresses in a network, and the client is usually your computer.
For home networks or LANs, the DHCP Server is typically a router or gateway.
If you have access to the DHCP Server, you can view all relationships with IPs, MACs, interfaces, name of the device, and lease time in your LAN.
- Log into the DHCP Server. In this example, the DHCP server is the home gateway.
- If you don’t know the IP address of your DHCP Server/ Gateway, you can run an ipconfig (in Windows) or ifconfig (in macOS/Linux).
- This particular DHCP Server/Gateway has a web interface.
- Enter the IP address on the search bar of the web browser, and input the right credentials.
- Find the DHCP Clients List.
- In this TP-Link router, the DHCP Server functionality comes as an additional feature.
- Go to DHCP > DHCP Clients List. From this list, you can see the mapping between MAC addresses and their assigned IPs.
If you couldn’t find the IP in the ARP list or unfortunately don’t have access to the DHCP Server, as a last resort, you can use a sniffer.
Packet sniffers or network analyzers like Nmap (or Zenmap which is the GUI version) are designed for network security.
They can help identify attacks and vulnerabilities in the network.
With Nmap, you can actively scan your entire network and find IPs, ports, protocols, MACs, etc.
If you are trying to find the IP from a known MAC with a sniffer like Nmap, look for the MAC address within the scan results.
How to find the Device and IP with a Sniffer?
- Keep records of your network IP address information.
- In this case, my network IP is 192.168.0.0/24. If you don’t know it, a quick “ipconfig” in Windows cmd or an “ifconfig” in macOS or Linux terminal can show you the local IP and mask.
- If you can’t subnet, go online to a subnet calculator and find your network IP.
- Download and open Nmap.
- Download Nmap from this official link https://nmap.org/download.html and follow its straightforward installation process.
- Open Nmap (or Zenmap) and use the command “sudo nmap -sn (network IP)” to scan the entire network (without port scan).
- The command will list machines that respond to the Ping and will include their MAC address along with the vendor.
- Don’t forget the “sudo” command.
- Without it, you will not see MAC addresses.
Finding out the device vendor from a MAC address
Ok, so now you were able to find out the IP address using “arp -a” command or through the DHCP Server.
But what if you want to know more details about that particular device?
What vendor is it?
Your network segment or LAN might be full of different devices, from computers, firewalls, routers, mobiles, printers, TVs, etc.
And MAC addresses contain key information for knowing more details about each network device.
First, it is essential to understand the format of the MAC address.
Traditional MAC addresses are 48 bits represented in 12-digit hexadecimal numbers (or six octets).
The first half of the six octets represent the Organizational Unique Identifier (OUI) and the other half is the Network Interface Controller (NIC) which is unique for every device in the world.
There is not much we can do about the NIC, other than communicating with it.
But the OUI can give us useful information about the vendor if you didn’t use Nmap, which can also give you the hardware vendor.
A free online OUI lookup tool like Wireshark OUI Lookup can help you with this.
Just enter the MAC address on the OUI search, and the tool will look at the first three octets and correlate with its manufacturing database.
Although the RARP (the counterpart of ARP) was specifically designed to find IPs from MAC addresses, it was quickly discontinued because it had many drawbacks.
RARP was quickly replaced by DHCP and BOOTP.
But ARP is still one of the core functions of the IP layer in the TCP/IP protocol stack.
It finds MAC addresses from known IPs, which is most common in today’s communications.
ARP works under the hood to keep a frequently used list of MACs and IPs.
But you can also use it to see the current mappings with the command arp -a.
Aside from ARP, you can also use DHCP to view IP information. DHCP Servers are usually in charge of IP assignments.
If you have access to the DHCP server, go into the DHCP Client list and identify the IP with the MAC address.
Finally, you can use a network sniffer like Nmap, scan your entire network, and find IPs, and MACs.
If you only want to know the vendor, an online OUI lookup like Wireshark can help you find it quickly.