{"id":23234,"date":"2026-09-07T15:20:03","date_gmt":"2026-09-07T07:20:03","guid":{"rendered":"https:\/\/cciedump.spoto.net\/blog\/?p=23234"},"modified":"2026-09-07T15:20:07","modified_gmt":"2026-09-07T07:20:07","slug":"does-the-arp-protocol-have-a-port-number","status":"publish","type":"post","link":"https:\/\/cciedump.spoto.net\/blog\/does-the-arp-protocol-have-a-port-number_23234.html","title":{"rendered":"Does the ARP Protocol Have a Port Number?"},"content":{"rendered":"\n<p>Search for &#8220;ARP protocol port number&#8221; and you&#8217;ll find a surprising number of confidently wrong answers \u2014 some list port 67, others guess at a made-up value, and plenty of certification study guides use this exact question as a trick to catch students who assume every protocol works the same way. The real answer is simpler than any of those guesses: ARP doesn&#8217;t have a port number at all, because port numbers aren&#8217;t a concept that applies to it. This article explains why that&#8217;s the case, how ARP frames are actually identified without one, how to spot ARP traffic yourself in a packet capture, where ARP fits on a broader list of protocols and their port numbers (or lack thereof), and how to handle this exact question if it comes up on a certification exam.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy counter-decimal ez-toc-light-blue\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/cciedump.spoto.net\/blog\/does-the-arp-protocol-have-a-port-number_23234.html\/#Why_ARP_Doesnt_Use_a_Port_Number\" title=\"Why ARP Doesn&#8217;t Use a Port Number\">Why ARP Doesn&#8217;t Use a Port Number<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/cciedump.spoto.net\/blog\/does-the-arp-protocol-have-a-port-number_23234.html\/#EtherType_0x0806_vs_Port_Numbers_How_Protocols_Are_Actually_Identified\" title=\"EtherType 0x0806 vs. Port Numbers: How Protocols Are Actually Identified\">EtherType 0x0806 vs. Port Numbers: How Protocols Are Actually Identified<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/cciedump.spoto.net\/blog\/does-the-arp-protocol-have-a-port-number_23234.html\/#Capturing_and_Inspecting_ARP_Frames_in_Wireshark\" title=\"Capturing and Inspecting ARP Frames in Wireshark\">Capturing and Inspecting ARP Frames in Wireshark<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/cciedump.spoto.net\/blog\/does-the-arp-protocol-have-a-port-number_23234.html\/#Common_Protocols_and_Their_Port_Numbers_Including_Protocols_With_None\" title=\"Common Protocols and Their Port Numbers (Including Protocols With None)\">Common Protocols and Their Port Numbers (Including Protocols With None)<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/cciedump.spoto.net\/blog\/does-the-arp-protocol-have-a-port-number_23234.html\/#ARP_Port_Number_Certification_Exam_Practice_Questions\" title=\"ARP Port Number: Certification Exam Practice Questions\">ARP Port Number: Certification Exam Practice Questions<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Why_ARP_Doesnt_Use_a_Port_Number\"><\/span>Why ARP Doesn&#8217;t Use a Port Number<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Port numbers exist to distinguish between different applications or services running on top of TCP or UDP at the Transport Layer \u2014 but ARP doesn&#8217;t operate at that layer at all, which is the entire reason it has no port number to speak of.<\/p>\n\n\n\n<ol><li><strong>Port numbers are a Transport Layer (Layer 4) concept.<\/strong> TCP and UDP use port numbers to direct incoming data to the correct application or service on a device \u2014 for example, port 443 for HTTPS traffic or port 53 for DNS. This system only exists within protocols built on top of TCP or UDP.<\/li><li><strong>ARP operates at the Data Link Layer (Layer 2), not the Transport Layer.<\/strong> As covered in earlier discussions of how ARP resolves IP addresses to MAC addresses, ARP&#8217;s entire function takes place below the Network layer where IP operates \u2014 meaning it&#8217;s even further removed from the Transport layer than IP itself.<\/li><li><strong>ARP is encapsulated directly inside an Ethernet frame, not inside an IP packet.<\/strong> Because it doesn&#8217;t rely on IP for delivery, it also has no need for the TCP\/UDP header structure that carries port numbers \u2014 ARP messages go straight from the Data Link layer&#8217;s Ethernet framing without ever touching a Transport-layer header.<\/li><li><strong>Without a Transport Layer presence, there&#8217;s simply nothing for a port number to attach to.<\/strong> Asking &#8220;what port does ARP use&#8221; is a bit like asking what zip code a phone call uses \u2014 it&#8217;s a reasonable-sounding question built on a category error, since the concept it&#8217;s asking about doesn&#8217;t apply to the layer ARP actually operates at.<\/li><\/ol>\n\n\n\n<p>If ARP doesn&#8217;t use a port number to identify itself, though, something else has to let Ethernet know that a given frame is carrying an ARP message rather than, say, an IP packet \u2014 and that&#8217;s exactly the role played by the EtherType field, covered next.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"EtherType_0x0806_vs_Port_Numbers_How_Protocols_Are_Actually_Identified\"><\/span>EtherType 0x0806 vs. Port Numbers: How Protocols Are Actually Identified<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Since port numbers only apply within TCP\/UDP, ARP is identified using a completely different mechanism built into the Ethernet frame header itself. Here&#8217;s how the two identification systems compare.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Aspect<\/th><th scope=\"col\">Port Numbers (TCP\/UDP)<\/th><th scope=\"col\">EtherType (Ethernet Frame Header)<\/th><\/tr><\/thead><tbody><tr><td><strong>OSI Layer<\/strong><\/td><td>Layer 4 (Transport)<\/td><td>Layer 2 (Data Link)<\/td><\/tr><tr><td><strong>Purpose<\/strong><\/td><td>Identifies which application\/service on a device should receive the data<\/td><td>Identifies which protocol&#8217;s payload the Ethernet frame is carrying<\/td><\/tr><tr><td><strong>Field location<\/strong><\/td><td>Inside the TCP or UDP header, which sits inside an IP packet<\/td><td>Inside the Ethernet frame header itself, before any IP or Transport-layer data<\/td><\/tr><tr><td><strong>Example value<\/strong><\/td><td>Port 80 (HTTP), Port 443 (HTTPS), Port 53 (DNS)<\/td><td><code>0x0800<\/code> for IPv4, <code>0x0806<\/code> for ARP, <code>0x86DD<\/code> for IPv6<\/td><\/tr><tr><td><strong>Used by ARP?<\/strong><\/td><td>No \u2014 ARP has no Transport-layer component<\/td><td>Yes \u2014 ARP frames are marked with EtherType <code>0x0806<\/code><\/td><\/tr><tr><td><strong>Value range\/format<\/strong><\/td><td>16-bit number (0-65535)<\/td><td>16-bit hexadecimal value defined by an IEEE-managed registry<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>The takeaway:<\/strong> where a Transport-layer protocol like HTTP relies on a port number to specify which application should handle the data once it arrives, ARP is identified far earlier in the process \u2014 the moment a device reads the Ethernet frame header, the EtherType value of <code>0x0806<\/code> immediately tells it &#8220;this is an ARP message,&#8221; with no need to unpack an IP packet or look for a port at all. This is also exactly the field you&#8217;d look for if you wanted to isolate ARP traffic yourself in a packet capture.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Capturing_and_Inspecting_ARP_Frames_in_Wireshark\"><\/span>Capturing and Inspecting ARP Frames in Wireshark<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Seeing the EtherType field in action is one of the clearest ways to understand how ARP identification actually works \u2014 and Wireshark makes this straightforward to observe directly.<\/p>\n\n\n\n<ol><li><strong>Open Wireshark and select the correct network interface.<\/strong> Choose the interface currently handling your traffic (typically your active Wi-Fi or Ethernet adapter) and start a live capture.<\/li><li><strong>Generate some ARP traffic to capture.<\/strong> On most systems, simply pinging another device on your local network, or clearing your ARP cache and then accessing a local resource, will trigger a fresh ARP request and reply.<\/li><li><strong>Apply a display filter to isolate ARP traffic.<\/strong> In the filter bar at the top of Wireshark, type:<\/li><\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">arp<\/code><\/pre>\n\n\n\n<p>This filters the capture down to only ARP request and reply frames, hiding all other traffic types. 4. <strong>Select an ARP frame to inspect it.<\/strong> Click on any listed ARP packet, then expand the <strong>Ethernet II<\/strong> section in the packet details pane below. 5. <strong>Locate the EtherType field.<\/strong> Within the Ethernet II header details, you&#8217;ll see a field labeled <strong>Type<\/strong>, showing the value <code>0x0806<\/code> \u2014 this is the exact mechanism discussed in the comparison above, visible in real captured traffic. 6. <strong>Expand the Address Resolution Protocol section.<\/strong> Below the Ethernet header, Wireshark breaks down the ARP-specific fields, including the opcode (request or reply), sender\/target MAC addresses, and sender\/target IP addresses \u2014 letting you directly observe the request-and-reply exchange in action. 7. <strong>Compare against a non-ARP frame for contrast.<\/strong> Click on a regular IPv4 packet in the same capture and check its EtherType field \u2014 you&#8217;ll see <code>0x0800<\/code> instead, confirming how Ethernet distinguishes between protocol types using this field rather than anything resembling a port number.<\/p>\n\n\n\n<p>Seeing the absence of a TCP\/UDP header entirely in an ARP frame \u2014 and the presence of the EtherType field doing the identification work instead \u2014 makes the Layer 2 vs. Layer 4 distinction covered earlier far more concrete than reading about it alone.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Common_Protocols_and_Their_Port_Numbers_Including_Protocols_With_None\"><\/span>Common Protocols and Their Port Numbers (Including Protocols With None)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>With ARP&#8217;s situation now clear, it helps to see where it fits alongside other common protocols \u2014 some of which use well-known ports, and some of which, like ARP, don&#8217;t use port numbers at all.<\/p>\n\n\n\n<ul><li><strong>HTTP \u2014 Port 80 (TCP):<\/strong> Standard unencrypted web traffic.<\/li><li><strong>HTTPS \u2014 Port 443 (TCP):<\/strong> Encrypted web traffic, now the default for most websites.<\/li><li><strong>DNS \u2014 Port 53 (TCP\/UDP):<\/strong> Domain name resolution; typically UDP for standard lookups, TCP for larger responses or zone transfers.<\/li><li><strong>FTP \u2014 Ports 20 and 21 (TCP):<\/strong> File transfer; port 21 for control commands, port 20 for the actual data transfer.<\/li><li><strong>SSH \u2014 Port 22 (TCP):<\/strong> Secure remote command-line access.<\/li><li><strong>Telnet \u2014 Port 23 (TCP):<\/strong> Unencrypted remote access, largely deprecated in favor of SSH.<\/li><li><strong>SMTP \u2014 Port 25 (TCP):<\/strong> Sending email between mail servers.<\/li><li><strong>DHCP \u2014 Ports 67 and 68 (UDP):<\/strong> Automatic IP address assignment; port 67 for the server, port 68 for the client.<\/li><li><strong>ARP \u2014 No port number:<\/strong> As covered throughout this article, ARP operates at Layer 2 using EtherType <code>0x0806<\/code>, bypassing the Transport layer entirely.<\/li><li><strong>ICMP \u2014 No port number:<\/strong> Used for diagnostic messages like ping; like ARP, ICMP doesn&#8217;t use TCP or UDP, though it does operate at Layer 3 (Network) rather than Layer 2, identified instead by a protocol number within the IP header rather than an EtherType field.<\/li><\/ul>\n\n\n\n<p>Keeping ARP and ICMP grouped mentally as &#8220;no-port protocols,&#8221; but for different layer-related reasons, is a useful distinction to hold onto \u2014 and it&#8217;s exactly the kind of distinction that certification exams like to probe directly, which brings us to the practice questions this topic most commonly generates.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"ARP_Port_Number_Certification_Exam_Practice_Questions\"><\/span>ARP Port Number: Certification Exam Practice Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Because &#8220;what port does ARP use&#8221; is such a common trick question on exams like CompTIA Network+ and CCNA, it&#8217;s worth being ready for a few different ways it can be phrased.<\/p>\n\n\n\n<p><strong>Q: What port number does ARP use?<\/strong> A: None. ARP does not use a TCP or UDP port number, since it operates at Layer 2 (Data Link) and doesn&#8217;t rely on the Transport layer at all, as detailed earlier in this article.<\/p>\n\n\n\n<p><strong>Q: At which OSI layer does ARP operate?<\/strong> A: Layer 2, the Data Link layer \u2014 this is the underlying reason it has no port number, since port numbers are strictly a Layer 4 concept.<\/p>\n\n\n\n<p><strong>Q: How is an ARP frame identified within an Ethernet frame?<\/strong> A: By the EtherType field in the Ethernet header, set to <code>0x0806<\/code> for ARP \u2014 as shown in the comparison table and confirmed via packet capture earlier in this article.<\/p>\n\n\n\n<p><strong>Q: True or false \u2014 like DNS, ARP can use either TCP or UDP depending on the situation.<\/strong> A: False. This is a common distractor answer choice; ARP doesn&#8217;t use TCP or UDP at all, unlike DNS (Port 53) which genuinely does use both depending on the query type.<\/p>\n\n\n\n<p><strong>Q: Which other common protocol also has no assigned port number, and why?<\/strong> A: ICMP. Like ARP, it bypasses TCP\/UDP entirely \u2014 though for a different reason, since ICMP operates at Layer 3 and is identified via a protocol number in the IP header rather than an Ethernet-level EtherType field, as noted in the protocol list above.<\/p>\n\n\n\n<p><strong>Q: If a question asks for ARP&#8217;s &#8220;port number&#8221; as a multiple-choice option, and 67, 68, 806, and &#8220;N\/A&#8221; are listed, which is correct?<\/strong> A: &#8220;N\/A&#8221; (or an equivalent &#8220;none&#8221; option) is correct. Port 67\/68 belongs to DHCP, and 806 is a common decoy referencing ARP&#8217;s EtherType value in decimal rather than an actual port number \u2014 a frequent trap in exactly this kind of question.<\/p>\n\n\n\n<p>Between understanding why ARP skips the Transport layer entirely, how EtherType handles identification in its place, what that looks like in an actual packet capture, where ARP sits alongside protocols that do use ports, and how to handle the exam questions built around this exact confusion, there&#8217;s no ambiguity left: ARP simply doesn&#8217;t have a port number, and now you know precisely why.<\/p>\n<div class='sfsi_Sicons' style='width: 100%; display: inline-block; vertical-align: middle; text-align:left'><div style='margin:0px 8px 0px 0px; line-height: 24px'><span>Please follow and like us:<\/span><\/div><div class='sfsi_socialwpr'><div class='sf_fb_share sf_icon' style='text-align:left;vertical-align: middle;'><a href='https:\/\/www.facebook.com\/sharer\/sharer.php?u=https%3A%2F%2Fcciedump.spoto.net%2Fblog%2Fdoes-the-arp-protocol-have-a-port-number_23234.html' style='display:inline-block;'  > <img class='sfsi_wicon'  data-pin-nopin='true' width='auto' height='auto' alt='fb-share-icon' title='Facebook Share' src='https:\/\/cciedump.spoto.net\/blog\/wp-content\/plugins\/ultimate-social-media-icons\/images\/visit_icons\/fbshare_bck.png'  \/><\/a><\/div><div class='sf_twiter sf_icon' style='display: inline-block;vertical-align: middle;width: auto;margin-left: 7px;'>\r\n\t\t\t\t\t\t<a target='_blank' href='https:\/\/twitter.com\/intent\/tweet?text=Does+the+ARP+Protocol+Have+a+Port+Number%3F+https:\/\/cciedump.spoto.net\/blog\/does-the-arp-protocol-have-a-port-number_23234.html'style='display:inline-block' >\r\n\t\t\t\t\t\t\t<img data-pin-nopin= true width='auto' class='sfsi_wicon' src='https:\/\/cciedump.spoto.net\/blog\/wp-content\/plugins\/ultimate-social-media-icons\/images\/visit_icons\/en_US_Tweet.svg' alt='Tweet' title='Tweet' >\r\n\t\t\t\t\t\t<\/a>\r\n\t\t\t\t\t<\/div><div class='sf_pinit sf_icon' style='text-align:left;vertical-align: middle;float:left;line-height: 33px;width:auto;margin: 0 -2px;'><a href='#'  onclick='sfsi_pinterest_modal_images(event,\"https:\/\/cciedump.spoto.net\/blog\/does-the-arp-protocol-have-a-port-number_23234.html\",\"Does the ARP Protocol Have a Port Number?\")' style='display:inline-block;'  > <img class='sfsi_wicon'  data-pin-nopin='true' width='auto' height='auto' alt='fb-share-icon' title='Pin Share' src='https:\/\/cciedump.spoto.net\/blog\/wp-content\/plugins\/ultimate-social-media-icons\/images\/share_icons\/Pinterest_Save\/en_US_save.svg'  \/><\/a><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Search for &#8220;ARP protocol port number&#8221; and you&#8217;ll find a surprising number of confidently wrong answers \u2014 some list port 67, others guess at a made-up value, and plenty of certification study guides use this exact question as a trick to catch students who assume every protocol works the same way. 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