List of TCP and UDP port numbers/etc/services, a service name database file on Unix- like operating systems.[1][2][3][4]This is a list of notable port numbers used by protocols of the transport layer of the Internet protocol suite for the establishment of host- to- host connectivity. Originally, port numbers were used by the Network Control Program (NCP) in the ARPANET for which two ports were required for half- duplex transmission. Later, the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) needed only one port for full- duplex, bidirectional traffic. PokéNatomy—An Unofficial Guide to the Science of Pokémon is a newly available book that takes a biological look at the original 150 Pokémon. This is a list of notable port numbers used by protocols of the transport layer of the Internet protocol suite for the establishment of host-to-host connectivity. You’d think the library would want your used books! But outside of the occasional used-book sale, libraries usually only get their books from specific vendors. By. MS Paint, the first app you used for editing images, will probably be killed off in future updates of Windows 10, replaced by the new app Paint 3D. Microsoft lists. ![]() The even- numbered ports were not used, and this resulted in some even numbers in the well- known port number range being unassigned. The Stream Control Transmission Protocol (SCTP) and the Datagram Congestion Control Protocol (DCCP) also use port numbers. They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they exist. The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses.[5] However, many unofficial uses of both well- known and registered port numbers occur in practice. Similarly many of the official assignments refer to protocols that were never or are no longer in common use. This article lists port numbers and their associated protocols that have experienced significant uptake. Table legend[edit] Official: Port is registered with IANA for the application.[5] Unofficial: Port is not registered with IANA for the application. Multiple use: Multiple applications are known to use this port. ![]() ![]() Well- known ports[edit]The port numbers in the range from 0 to 1. They are used by system processes that provide widely used types of network services. On Unix- like operating systems, a process must execute with superuser privileges to be able to bind a network socket to an IP address using one of the well- known ports.[1]Well- known ports. Port. TCPUDPDescription. IANA status. 0N/AN/AIn programming APIs (not in communication between hosts), requests a system- allocated (dynamic) port[7]N/A0. Reserved. Reserved. Reserved. Official. TCPAssigned. TCP Port Service Multiplexer (TCPMUX). Historic. Both TCP and UDP have been assigned to TCPMUX by IANA,[5] but by design only TCP is specified.[8]Official. Reserved. Reserved. Unassigned. Official. TCPUDPRemote job entry. Official. 6Reserved. Reserved. Unassigned. Official. 7TCPUDPEcho Protocol[9][1. Official. 8Reserved. Reserved. Unassigned. Official. 9UDPDiscard Protocol[1. Official. 9UDPWake- on- LAN[1. Unofficial. 10. Reserved. Reserved. Unassigned. Official. 11. TCPUDPActive Users (systat service)[1. Official. 12. Reserved. Reserved. Unassigned. Official. 13. TCPUDPDaytime Protocol[1. Official. 14. Reserved. Reserved. Unassigned. Official. 15. TCPUDPPreviously netstat service[5][1. Unofficial. 16. Reserved. Reserved. Unassigned.Official. 17. TCPUDPQuote of the Day (QOTD)[1.Official. 18. TCPUDPMessage Send Protocol[1. . Official. 19. TCPUDPCharacter Generator Protocol (CHARGEN)[2. Official. 20. Assigned. there. File Transfer Protocol (FTP) data transfer[1.Official. 21. Assigned.File Transfer Protocol (FTP) control (command)[1.Official. 22. UDPSecure Shell (SSH),[1.Official. 23. TCPAssigned.Telnet protocol—unencrypted text communications[1. Official. 25. TCPAssigned. Simple Mail Transfer Protocol (SMTP),[1. Official. 26. Reserved. Reserved. Unassigned. Official. 37. TCPUDPTime Protocol[2. Official. 38. TCPUDPRoute Access Protocol (RAP)[2. Official. 39. TCPUDPResource Location Protocol (RLP)[2. Official. 40. Reserved. Reserved. Unassigned. Official. 42. TCPUDPHost Name Server Protocol[2. Official. 43. TCPUDPWHOIS protocol[2. Official. 49. TCPUDPTACACS+ Login Host protocol[3. Official. 50. TCPUDPRemote Mail Checking Protocol[3. Official. 51. Reserved. Official. 51. TCPUDPPreviously Interface Message Processor logical address management[citation needed]Unofficial. TCPUDPXerox Network Systems (XNS) Time Protocol[importance?]Official. TCPUDPDomain Name System (DNS)[1. Official. 54. TCPUDPXerox Network Systems (XNS) clearinghouse[importance?]Official. TCPUDPXerox Network Systems (XNS) authentication[importance?]Official. TCPUDPAny private terminal access[further explanation needed]Official. TCPUDPXerox Network Systems (XNS) Mail[importance?]Official. Assigned. UDPBootstrap Protocol (BOOTP) server; [1. Dynamic Host Configuration Protocol (DHCP)Official. Assigned. UDPBootstrap Protocol (BOOTP) client; [1. Dynamic Host Configuration Protocol (DHCP)Official. Assigned. UDPTrivial File Transfer Protocol (TFTP)[1. Official. 70. TCPUDPGopher protocol[3. Official. 71–7. 4TCPUDPNETRJS protocol[3. Official. 75. TCPUDPAny private dial out service[further explanation needed]Official. TCPUDPAny private Remote job entry[further explanation needed]Official. TCPAssigned. Finger protocol[1. Official. 80. UDP[4. Hypertext Transfer Protocol (HTTP)[1. Official. 80. UDPQUIC (from Chromium) for HTTP[citation needed]Unofficial. N/AN/AUnassigned. Official. 81. TCPTor. Parkonion routing[verification needed]Unofficial. UDPTor. Park control[verification needed]Unofficial. Any private terminal link[further explanation needed]Official. TCPAssigned. Kerberos[1. Official. 90. TCPUDPdnsix (Do. D Network Security for Information Exchange) Securit [sic?] Attribute Token Map[importance?]Official. TCPUDPPoint. Cast (dotcom)[5][third- party source needed]Unofficial. TCPWIP message protocol[verification needed]Unofficial. N/AN/AUnassigned (with known unauthorized use[further explanation needed])[5]Official. TCPUDPNIChost name. Official. 10. 2TCPUDPISO Transport Service Access Point (TSAP) Class 0 protocol; [4. Official. 10. 4TCPUDPDigital Imaging and Communications in Medicine (DICOM; also port 1. Official. 10. 5TCPUDPCCSO Nameserver[5. Official. 10. 7TCPUDPRemote User Telnet Service (RTelnet)[5. Official. 10. 8TCPUDPIBM Systems Network Architecture (SNA) gateway access server. Official. 10. 9TCPUDPPost Office Protocol, version 2 (POP2)[5. Official. 11. 0TCPAssigned. Post Office Protocol, version 3 (POP3)[1. Official. 11. 1TCPUDPOpen Network Computing Remote Procedure Call (ONC RPC, sometimes referred to as Sun RPC)Official. TCPVirtual Router Redundancy Protocol (VRRP)[5. Unofficial. 11. 3TCPIdent, authentication service/identification protocol,[1. IRC servers to identify users. Official. 11. 3TCPAssigned. Authentication Service (auth), the predecessor to identification protocol. Used to determine a user's identity of a particular TCP connection.[5. Official. 11. 4N/AN/AUnassigned (deprecated since June 2. Official. 11. 5TCPUDPSimple File Transfer Protocol[1. Official. 11. 7TCPUDPUUCP Mapping Project (path service)[citation needed]Official. TCPUDPStructured Query Language (SQL) Services[Jargon]Official. TCPAssigned. Network News Transfer Protocol (NNTP),[1. Official. 12. 3Assigned. UDPNetwork Time Protocol (NTP), used for time synchronization[1. Official. 12. 6TCPUDPFormerly Unisys Unitary Login, renamed by Unisys to NXEdit. Used by Unisys Programmer's Workbench for Clearpath MCP, an IDE for Unisys MCP software development. Official. 13. 5TCPUDPDCEendpoint resolution. Official. 13. 5TCPUDPMicrosoft EPMAP (End Point Mapper), also known as DCE/RPC Locator service,[6. DHCP server, DNS server and WINS. Also used by DCOMOfficial. Assigned. UDPNet. BIOS Name Service, used for name registration and resolution[6. Official. 13. 8TCPUDPNet. BIOS Datagram Service[1. Official. 13. 9TCPAssigned. Net. BIOS Session Service[6. Official. 14. 3TCPAssigned. Internet Message Access Protocol (IMAP),[1. Official. 15. 2TCPUDPBackground File Transfer Program (BFTP)[6. Official. 15. 3TCPUDPSimple Gateway Monitoring Protocol (SGMP), a protocol for remote inspection and alteration of gateway management information[6. Official. 15. 6TCPUDPStructured Query Language (SQL) Service[Jargon]Official. TCPUDPDistributed Mail System Protocol (DMSP, sometimes referred to as Pcmail)[6. Official. 16. 1Assigned. UDPSimple Network Management Protocol (SNMP)[6. Official. 16. 2TCPUDPSimple Network Management Protocol Trap (SNMPTRAP)[6. Official. 17. 0TCPUDPPrint server[verification needed]Official. TCPUDPX Display Manager Control Protocol (XDMCP), used for remote logins to an X Display Manager server[7. Official. 17. 9UDPBorder Gateway Protocol (BGP),[7. AS) on the Internet. Official. 18. 0TCPUDPRelational Interface System (ris) Intergraph[citation needed]Official. TCPUDPInternet Relay Chat (IRC)[7. Official. 19. 9TCPUDPSNMP multiplexing protocol (SMUX)[7. Official. 20. 1TCPUDPApple. Talk Routing Maintenance. The Library (Usually) Doesn't Want Your Used Books.You’d think the library would want your used books!But outside of the occasional used- book sale, libraries usually only get their books from specific vendors.By dumping your used books on them, you’re actually creating work for volunteers and making things worse.We talked to librarian Stephanie Anderson, Assistant Director of Selection at Book. . Ops (the shared technical services collaboration of New York Public Library and Brooklyn Public Library). She explained what’s so bad about dumping your books on the library, and why they don’t want them. Ask First“Almost all libraries have a well- defined policy on donations,” says Anderson. So look it up before you cart your books over. It is likely to be on their website, and if not, you can ask at any desk in a library, or call them.” Ask them who does want your used books, and they’ll usually have an answer ready. And if the library does want your books, you don’t have to read this post! Congratulations! Most Libraries Can’t Use Your Books. Anderson knows that would- be donors have good intentions. But, she says, “when you insist on donating books to a library that doesn’t accept them, or insist on donating books that a library can’t use, it’s disrespectful of the institution you’re trying to support.”“You would not believe how many people get angry and argue with librarians when they learn about our donation policies,” says Anderson. Picture that embarrassing kind of person, throwing a fit because they didn’t do their research. Never be that person! An important aspect of having well- rounded finances is charity. Giving is generally accepted by…Read more Read. Why They Don’t Want Your Books In short, books aren’t all the same, and the ones you’re getting rid of aren’t the ones the library needs, says Anderson. Not even the new ones: In a best case scenario, we can do one of two things with a donated book: add it to the collection, or put it in a book sale. Many novice book donors expect us to do the former, but we almost never do, because it is highly unlikely that we need the book donated at the time it is donated. In order to spend book budgets wisely, we do a lot of planning, and that planning can’t depend on book donations. Instead, libraries buy from vendors. It’s the only way to reliably match supply to demand, and to get fresh books that definitely don’t have bedbugs or other hidden defects. And buying the physical book isn’t the only part that costs money. Even If They Use Your Book, It’s Not Free When the library adds a new book to their collection, they don’t just unbox it and slide it onto the shelf. They have to add a barcode, spine label, and laminate it or add a clear Mylar cover so it lasts longer. They have to assign that barcode and add the book to the catalog. These all cost the library money, as does the time of the staff member who processes the book,” says Anderson. Libraries never have enough staff time.”The library also needs space to shelve each new book. Because they’re already doing their job buying all the books they need, your unneeded book is just using up space until the staff spends more time recycling it. When You Can Donate Books Of course, this doesn’t apply to book sales, which the library uses to raise funds and to dispose of its own extra books. They won’t always need 2. John Grisham.) Still, check the donation policy, which will probably disallow textbooks, magazines, and other materials that no one will buy. If you “donate” those, again, you’re creating work for the library. As mentioned, there are other exceptions, which you learned when you googled your library’s donation policy! The Brooklyn Public Library, for example, is running a pilot program at its central location, accepting new and gently- used books. What to Donate Instead You can still help! Most libraries will happily take your (tax- deductible) monetary donations. Many of us depend on these donations to keep our collections in good shape,” says Anderson, “and every dollar helps.”You can also volunteer, which will help you learn how libraries work, and appreciate the many things they do behind the scenes (and the many services they provide outside of books). Remember, most libraries are understaffed, and you’ll free up highly educated librarians for more technical work, so they’ll appreciate the help. Here’s What to Do With All Those Books Well, the library probably told you where else to donate them. You could make money (or store credit) by selling them to a used bookstore. Or, and this will shock you, you’re allowed to throw them out. It’s part of the book circle of life!” says Anderson. It might feel weird! Books are magic. But they’re also produced in mass quantities, and now they’re all digitized as well. If your book is at all rare, it’s selling for lots of money on Amazon and Abe. Books, and that’s where you should take it. Otherwise don’t worry, there are plenty of copies somewhere for anyone who wants to read them. If your library doesn’t have this book, suggest that they buy a copy. They’d rather have a new one from a vendor, honestly. Anderson points out that almost everywhere in the country, books are recyclable. So your old books will get a second life, as an Amazon box for your new books.
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