Organization Service
DNS Report DNS & Mail Tests Report
DNS Stuff Domain, IP, Host: Lookups & Measurements
Internet Assigned Number Authority IANA Official Port Numbers List
Internet Ports DataBase Search for a Port
Snort: Open Source Network IDS Ports Search Web-based Traceroute services by country

Network Protocols

TCP/IP - Transmision Control Protocol / Internet Protocol

DHCP - Dynamic Host Configuration Protocol

The Dynamic Host Configuration Protocol (DHCP) is an Internet protocol for automating the configuration of computers that use TCP/IP. DHCP can be used to automatically assign dynamic IP addresses to devices on a network, to deliver TCP/IP stack configuration parameters such as the subnet mask and default router, and to provide other configuration information such as the addresses for printer, time and news servers.

BGP - Border Gateway Protocol

PPPoE/PPPoA - Point-to-Point Protocol over Ethernet/ATM

PPPoE (Point-to-Point Protocol over Ethernet) is a protocol used by many ADSL Internet Service Providers. There is also the PPPoA, PPP over ATM.

  • General PPPoE Information
    By Carrick Solutions Limited.
    RASPPPOE: PPP over Ethernet Protocol for Windows 95, 98, 98SE, ME, NT 4.0, 2000, XP, .NET. Free software by Robert Schlabbach.
  • Roaring Penguin PPPoE
    RP-PPPoE is a free PPPoE client for Linux, NetBSD and Solaris, by Roaring Penguin Software. If your ISP uses PPPoE, but has given you a router, you may not need a PPPoE client on your Linux box. DHCP may work fine. However, if you have a DSL "modem" and your provider uses PPPoE, you need a PPPoE client like RP-PPPoE to connect to your PPPoE service provider.

HTTP - HyperText Transfer Protocol

FTP - File Transfer Protocol

  • FTP - File Transfer Protocol
    By Dr. D. J. Bernstein.
    These pages are designed as a reference for the File Transfer Protocol (FTP). Unlike the IETF FTP specifications, these pages describe how FTP actually works (and doesn't work) in practice.
    ftpparse: ftpparse is a library written in C for parsing FTP LIST responses. ftpparse is Open Source by D. J. Bernstein. Commercial use of ftpparse is fine, as long as you inform him what programs you're using it in.
  • Pure-FTPd - A secure FTP daemon
    Pure-FTPd is a free (BSD), secure, production-quality and standard-conformant FTP server. It doesn't provide useless bells and whistles, but focuses on efficiency and ease of use. It provides simple answers to common needs, plus unique useful features for personal users as well as hosting providers. Security first: Pure-FTPd is actively supported, and it was always designed with security in mind, and the code is always re-audited as new kind of vulnerabilities are discussed. The server can run with privilege separation for paranoid security. It can even run 100% non-root, with its built-in chroot() emulation and virtual accounts. Transmission of cleartext passwords and commands can be avoided: Pure-FTPd has optional support for an SSL/TLS encryption layer using the OpenSSL library. Pure-FTPd works on your server: The same source code compiles and runs on Linux, OpenBSD, NetBSD, DragonflyBSD, FreeBSD, Solaris, Tru64, Darwin, Irix, HPUX, AIX and iPhone.
  • ProFTPd
    ProFTPD: Highly configurable GPL-licensed FTP server software. Projetado desde o início para ser um servidor FTP para Unix seguro e configurável. ProFTPD inclui amplos recursos de configuração, que os servidores em ambiente Win32 vêm oferecendo e que faltam no popular wu-ftp.
  • WU-FTPD Development Group
    Official repository of WU-FTPD. Wuarchive-ftpd, better known as wu-ftpd, is a replacement FTP daemon for Unix systems, developed at Washington University ( by Bryan D. O'Connor (who is no longer working on it or supporting it). wu-ftpd is the most popular ftp daemon on the Internet, used on many ftp sites all around the world. wu-ftpd is Open Source.
  • publicfile
    publicfile securely supplies files to the public through HTTP and FTP. By D. J. Bernstein.
  • utftpd: a TFTP server
    utftpd is a TFTP server with fine-grained access control, support for blksize (RFC 2348) and timeout options, and support for revision control. You can assign three different kinds of rights to every client: read, write, and create. utftpd is free software and released under the GNU General Public Licence. The package uses GNU autoconf and is aimed to be portable. Hosted by Uwe Ohse.

WAP - Wireless Application Protocol

  • WAP Forum
    "WAP - The de facto worldwide standard for providing Internet communications and advanced telephony services on digital mobile phones, pagers, personal digital assistants (PDAs) and other wireless terminals."
    WAP Forum Technical: Specificatrions, White papers, Developer Area.
  • Nokia - WAP on Web
  • Ericsson Mobile Internet
  • WAP Brasil [In Portuguese]
    WAPBrasil - o Site da Comunidade WAP (Wireless Application Protocol) do Brasil. Aqui estão disponíveis o fórum de discussão nacional sobre WAP, coletânea de notícias sobre Internet Móvel, ferramentas para desenvolvimento de páginas WML, browsers e simuladores, e mais.
  • Wireless Developers >> MsgCelular [In Portuguese]
    O Wireless Developers é a seção do MsgCelular dedicada a todos os desenvolvedores de tecnologias wireless, em especial WAP e SMS. Aqui você encontra programas para downloads, links e dicas para construir sites e serviços wireless.
    Wireless Developers WAP: Referência de WML e WML Script, Softwares de desenvolvimento para WAP, Provedores de hospedagem gratuita para WAP, Fóruns e tutoriais para aprendizagem de WML.
  • WABClub Brasil [In Portuguese]
    Site dedicado a informar a respeito da tecnologia de acesso a internet WAP. História e Visão geral, Downloads, Exemplos e Tutoriais WML, WAP Forum, Operadoras e Servidores. Linux, ASP e PHP com WAP.
  • eGroups : webwap [In Portuguese]
    Grupo de discussão em língua portuguesa sobre tecnologia WAP, programação WML e WMLS. Direcionada a desenvolvedores.
  • Forum WAP [In Portuguese]
  • GOWap Brasil [In Portuguese]
    "O Portal WAP do seu celular"

SNMP - Simple Network Management Protocol

    This site provides links and information about SNMP (Simple Network Management Protocol) and MIB (Management Information Base).
    SNMP FAQ (parts 1 & 2) from comp.protocols.snmp newsgroup. Editors: Panther Digital. Mirrors: SNMP FAQs at, SNMP FAQs at SNMP Research.
  • CERT Advisory CA-2002-03
    CA-2002-03: Multiple Vulnerabilities in Many Implementations of the Simple Network Management Protocol (SNMP). Last revised: Aug 18, 2003. Source: CERT/CC.
  • Book: Essential SNMP (326 pp.)
    Authors: Douglas Mauro, Kevin Schmidt / Publisher: O'Reilly Media, July 2001 / ISBN: 0-596-00020-0.
  • Net-SMNP
    Previously known as ucd-snmp. Net-SMNP is an open source package of various tools relating to the Simple Network Management Protocol (SNMP), including: an extensible agent and a notification receiver; an SNMP library; command-line tools to request or set information from SNMP agents; tools to generate and handle SNMP traps; a slew of SNMP related perl modules; a version of the unix 'netstat', and 'df' commands using SNMP; a Tk/perl mib browser.

Network and Device Monitoring

  • Nagios
    Enterprise-Class Open Source Monitoring. Nagios is the leader in system, network, and application monitoring. It's the industry standard for good reason.
  • MRTG: The Multi Router Traffic Grapher
    The Multi Router Traffic Grapher (MRTG) is a tool to monitor the traffic load on network-links. MRTG generates HTML pages containing graphical images which provide a LIVE visual representation of this traffic. MRTG is based on Perl and C and works under UNIX and Windows NT. MRTG is freely available under the terms of the GNU General Public License.
  • RRD Tool
    RRD is the acronym for Round Robin Database. RRD is a system to store and display time-series data (i.e. network bandwidth, machine-room temperature, server load average). It stores the data in a very compact way that will not expand over time, and it presents useful graphs by processing the data to enforce a certain data density. It can be used either via simple wrapper scripts (from shell or Perl) or via frontends that poll network devices and put a friendly user interface on it. If you know MRTG, you can think of RRDtool as a reimplementation of MRTG's graphing and logging features. But RRDtool is not a replacement for MRTG, as it does not implement the frontend and data aquisition features of MRTG. RRDtool currently compiles on a number of different Unix platforms as well as on NT. RRDtool is open source available under the terms of the GNU GPL. By Tobi Oetiker.
    RRDtool Front-ends.
  • Cacti
    Cacti is a complete frontend to RRDTool, it stores all of the necessary information to create graphs and populate them with data in a MySQL database. The frontend is completely PHP driven. Along with being able to maintain Graphs, Data Sources, and Round Robin Archives in a database, cacti handles the data gathering. There is also SNMP support (using net-snmp) for those used to creating traffic graphs with MRTG. Cacti is released under the GNU GPL, meaning that it is completely free.
    SourceForge Project: cacti.

Network Services

DNS - Domain Name Service

  • DNS Resources Directory (DNSRD)
    By András Salamon,
    General information, Reference material, Software, Names and registration, DNS Standards.
  • DNS Report
    DNS & Mail Tests Report. DNS report categories: Parent, NS, SOA, MX, Mail, WWW.
    This site will provide you with a DNS report for your domain. A very large percentage of domains have DNS problems; this site will help you find those problems and fix them. Also, the "Mail Test" tool will help find mail delivery problems for your domain.
    There is no cost for the DNS Report. If you find it useful, and you have a need for anti-spam or anti-virus software for your mail server, please consider looking at the best of breed Declude products, the sponsor of this site. Thanks!
  • DNS Stuff
    Domain Tests, IP Tests, Hostname Tests. DNS tools, DNS timing, smart WHOIS lookup, tracert, ping, NetGeo, and other network tools.
    There is currently no cost for the DNS tests, and it is ad-free. You are free to link directly to this site. The 1,500,000+ hits a month are all sponsored by Computerized Horizons, so if you find these tools useful, and you have a need for anti-spam or anti-virus software for your mail server, please consider looking at their Declude products. Thanks!
  • djbdns: Domain Name System tools
    By D. J. Bernstein.


E-mail Transport - MTA, SMTP, POP

Usenet Newsgroups

    Usenet news for Everyone.
  • Google Groups
    Envie e leia comentários nos grupos de discussão da Usenet. Formerly

Microsoft - NDIS, Winsock

  • NDIS Developer's Reference
    Network Driver Interface Specification (NDIS) defines a standard API for "Network Interface Cards" (NIC's) hardware on Microsoft Windows platforms, to be used as a common programming interface by the "Media Access Controller" (MAC) device drivers as well as higher level protocol drivers (such as TCP/IP).
    NDIS White Papers, NDIS FAQ, Knowledge Base, Internet Resources.
  • WinSock Development Information
    The information here can help you with your Windows Sockets (WinSock) application development. Any WinSock developer -- novice or expert -- will find something useful among the sample source code, detailed reference files, and web links. Most of this material comes out of the book Windows Sockets Network Programming, which provides a detailed introduction, and complete reference to WinSock versions 1.1 and 2.0.
  • Winsock Programmer's FAQ
    Maintained by Warren Young, up to September 2001.

SMB - Server Message Block

  • - opening windows to a wider world
    Samba is an open source software suite that implements the Server Message Block (SMB) protocol for UNIX systems, providing seamless file and print services to SMB clients, such as Windows 9x/Me/NT/2000 or LanManager. SMB protocol is sometimes also referred to as the Common Internet File System (CIFS), LanManager or NetBIOS protocol.
  • Samba-TNG
    Samba-TNG is a fork of Samba. It was derived from the same code but is being developed independently. The main philosophical difference is that the Samba project wants to produce a Unix server capable of acting as an NT domain controller, whereas the Samba-TNG project wants to basically be an NT domain controller running on Unix, with a LDAP backend.


Email Standards & Protocols

SMTP - Simple Mail Transport Protocol

MIME - Multipurpose Internet Mail Extensions

MIME (Multipurpose Internet Mail Extensions) is a set of specifications which allows interchange of text and files through Internet mail, handling formats among different e-mail systems, character sets and text-only encoding.