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It also summarizes IPv6 and ICMPv6 header fields, including payload length, next header, hop limit, and ICMPv6 type/code/checksum concepts, plus detailed IPv6 address scopes such as link-local, unique local, multicast, and IPv4-compatible/mapped forms. The sheet additionally introduces extension headers and related RFC references.",{"@graph":63,"@context":119},[64,80,102],{"@type":65,"itemListElement":66},"BreadcrumbList",[67,71,74,77],{"item":68,"name":69,"@type":70,"position":9},"https://docshare.wps.com","Home","ListItem",{"item":72,"name":10,"@type":70,"position":73},"https://docshare.wps.com/template/",2,{"item":75,"name":51,"@type":70,"position":76},"https://docshare.wps.com/template/general/",3,{"item":78,"name":59,"@type":70,"position":79},"https://docshare.wps.com/template/ipv6_cheat_sheet-ipv6-basics-cheat-sheet/572493/",4,{"url":78,"name":59,"@type":81,"image":82,"author":87,"headline":59,"publisher":90,"fileFormat":93,"inLanguage":57,"description":61,"dateModified":94,"datePublished":95,"encodingFormat":93,"isAccessibleForFree":96,"interactionStatistic":97},"DigitalDocument",{"url":83,"@type":84,"width":85,"height":86},"https://docshare.wps.com/thumbnails/ipv6_cheat_sheet-ipv6-basics-cheat-sheet/572493.png","ImageObject",442,249,{"name":88,"@type":89},"Emma Wilson","Person",{"url":68,"name":91,"@type":92},"DocShare","Organization","application/pdf","2026-10-21","2026-10-13",true,{"@type":98,"interactionType":99,"userInteractionCount":101},"InteractionCounter",{"@type":100},"ViewAction",9,{"@type":103,"mainEntity":104},"FAQPage",[105,111,115],{"name":106,"@type":107,"acceptedAnswer":108},"What are the key characteristics of IPv6 compared with IPv4?","Question",{"text":109,"@type":110},"The sheet lists IPv6 as the successor of IPv4 with 128-bit addresses, a vastly larger address space, no broadcasts and no NAT, and support for stateless address configuration and IPsec. It also notes a fixed IPv6 header size of 40 bytes and extension headers.","Answer",{"name":112,"@type":107,"acceptedAnswer":113},"How is an IPv6 address structured and shortened in notation?",{"text":114,"@type":110},"An IPv6 address is written in hexadecimal as eight pairs of two-byte blocks (four hex digits each). It can be shortened by skipping leading zeros within each block and compressing consecutive zero blocks using a double colon (::).",{"name":116,"@type":107,"acceptedAnswer":117},"What is the modified EUI-64 method for forming the interface ID?",{"text":118,"@type":110},"The cheat sheet explains transforming a 48-bit MAC into a 64-bit interface ID by inverting the universal bit and inserting ff and fe bytes after the third byte. It references RFC 4291 Appendix A and RFC 4941 for the method.","https://schema.org",{"og:url":78,"og:type":121,"og:title":59,"og:site_name":91,"og:description":61},"article",{"robots":123,"canonical":78},"index,follow",{"doc_id":125,"site_id":56},572493,1792107667,{"code":4,"msg":5,"data":128},{"doc_id":125,"user_id":129,"nickname":88,"user_avatar":130,"doc_module":9,"category_id":50,"category_name":51,"doc_title":59,"doc_description":61,"doc_content":131,"file_id":132,"file_url":133,"file_type":134,"file_size":135,"view_count":101,"is_deleted":4,"is_public":9,"is_downloadable":9,"audit_status":9,"page_count":73,"language":136,"language_code":57,"site_id":56,"html_lang":57,"table_of_contents":137,"faqs":138,"seo_title":139,"seo_description":61,"update_tm":140,"read_time":9},3848291630094,"https://eur-avatar.wpscdn.com/davatar_085a072bc5b1113ac321206ff7593b45","| 􀀁 􀀃 􀀄 􀀁 Internet Protocol Version 6 (IPv6) Basics Cheat Sheet by Jens Roesen\u003Cbr>IPv6 quick facts successor of IPv4 • 128-bit long addresses • that's 296 times the IPv4 address space • that's 2128 or 3.4x1038 or over 340 undecillion IPs overall • customer usually gets a /64 subnet, which yields 4 billion times the Ipv4 address space • no need for network address translation (NAT) any more • no broadcasts any more • no ARP • stateless address configuration without DHCP • improved multicast • easy IP renumbering • minimum MTU size 1280 • mobile IPv6 • mandatory IPsec support • fixed IPv6 header size of 40 bytes • extension headers • jumbograms up to 4 GiB |  |  |  |  |  |  |  |  |  | IPv6 Addresses |  |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n|  |  |  |  |  |  |  |  |  |  |  /64 – lan segment, 18,446,744,073,709,551,616 v6 IPs  /48 – subscriber site, 65536 /64 lan segments\u003Cbr> /32 – minimum allocation size, 65536 /48 subscriber sites, allocated to ISPs\u003Cbr>2001:0db8:0f61:a1ff:0000:0000:0000:0080\u003Cbr>global routing prefix subnet ID\u003Cbr>subnet prefix /64\u003Cbr>\u003Cbr>interface ID\u003Cbr>\u003Cbr>IPv6 addresses are written in hexadecimal and divided into eight pairs of two byte blocks, each containing four hex digits Addresses can be shortened by skipping leading zeros in each block This would shorten our example address to |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |\n| IPv6 & ICMPv6 Headers |  |  |  |  |  |  |  |  |  |  |  |\n| IPv6 header |  |  |  |  |  |  |  |  |  |  |  |\n|  | 0 |  | 8 |  | 16 |  | 24 | 32 |  | . .\u003Cbr>2001:db8:f61:a1ff:0:0:0:80 . Additionally, once per IPv6 IP, we can replace consecutive blocks of zeros with a\u003Cbr>double colon: 2001:db8:f61:a1ff::80 . |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  | The 64-bit interface ID can/should be in modified EUI-64 format. A 48-bit MAC can be transformed to an 64-bit interface ID by inverting the 7th (universal) bit and inserting a ff and fe byte after\u003Cbr>MAC\u003Cbr>00 03 ba 24 a9 6c\u003Cbr>\u003Cbr>the 3rd byte. So the MAC 00:03:ba:24:a9:c6 becomes EUI-64 02 03 ba ff fe 24 a9 6c\u003Cbr>0203:baff:fe24:a9c6 . See RFC 4291 Appendix A and RFC 4941.\u003Cbr> |  |\n|  | payload length |  |  |  | next header | hop limit |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |\n|  | source IPv6 address |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  |  |  |\n|  | destination IPv6 address |  |  |  |  |  |  |  |  | IPv6 Address Scopes |  |\n|  |  |  |  |  |  |  |  |  |  | ::/128 | unspecified address |\n|  |  |  |  |  |  |  |  |  |  | ::1/128 | localhost |\n| Version (4 bits): IP version. Always 6.\u003Cbr>Traffic class (8 bits): Used for QoS. Like the TOS field in IPv4 . RFC 2474.\u003Cbr>Flow label (20 bits): Used for packet labelling, End-to-end QoS. RFC 6437.\u003Cbr>Payload length (16 bits): Length of the payload following the header in bytes. Limits packet size to 64 KB. Next header (8 bits): Code for the following extension header or UL protocol. Like protocol type field in IPv4 .\u003Cbr>Hop limit (8 bits): Number of hops until the packet gets discarded. TTL in IPv4 .\u003Cbr>Source address (128 bit): IPv6 source address.\u003Cbr>Destination address (128 bits): IPv6 destination address.\u003Cbr>ICMPv6 header |  |  |  |  |  |  |  |  |  |  |  |\n|  |  |  |  |  |  |  |  |  |  | fe80::/10 | link local scope |\n|  |  |  |  |  |  |  |  |  |  | fec0::/10 | site local scope, intended as RFC 1918 successor, deprecated in RFC 3879 |\n|  |  |  |  |  |  |  |  |  |  | fc00::/7 | unique local unicast scope, RFC 4193, divided into: |\n|  |  |  |  |  |  |  |  |  |  | fc00::/8 | centrally assigned by unknown (see [http://bit.ly/IETFfc00](http://bit.ly/IETFfc00)), routed within a site |\n|  |  |  |  |  |  |  |  |  |  | fd00::/8 | free for all, global ID must be generated randomly, routed within a site |\n|  |  |  |  |  |  |  |  |  |  | ff00::/8 | multicast scope, after the prefix ff there are 4 b","cbCaij0tWK5uwOvT","https://ap.wps.com/l/cbCaij0tWK5uwOvT","pdf",302964,"English","# IPv6 quick facts\n# IPv6 Addresses\n## Address format and shortening rules\n## Subnet and prefix sizes (/64, /48, /32)\n## Interface ID and modified EUI-64\n# IPv6 & ICMPv6 Headers\n## IPv6 header fields\n## ICMPv6 header fields\n# IPv6 Address Scopes\n## Special-purpose and scope ranges\n# IPv6 Extension Headers","[{\"question\":\"What are the key characteristics of IPv6 compared with IPv4?\",\"answer\":\"The sheet lists IPv6 as the successor of IPv4 with 128-bit addresses, a vastly larger address space, no broadcasts and no NAT, and support for stateless address configuration and IPsec. It also notes a fixed IPv6 header size of 40 bytes and extension headers.\"},{\"question\":\"How is an IPv6 address structured and shortened in notation?\",\"answer\":\"An IPv6 address is written in hexadecimal as eight pairs of two-byte blocks (four hex digits each). It can be shortened by skipping leading zeros within each block and compressing consecutive zero blocks using a double colon (::).\"},{\"question\":\"What is the modified EUI-64 method for forming the interface ID?\",\"answer\":\"The cheat sheet explains transforming a 48-bit MAC into a 64-bit interface ID by inverting the universal bit and inserting ff and fe bytes after the third byte. It references RFC 4291 Appendix A and RFC 4941 for the method.\"}]","ipv6_cheat_sheet - IPv6 Basics Cheat Sheet | PDF",1791927736]