sipcalc - outra calculadora de subredes

Colaboração: Rubens Queiroz de Almeida

Data de Publicação: 15 de agosto de 2014

O aplicativo sipcalc é uma outra calculadora para ajudar na configuração de redes IP, tanto versão 4 quanto versão 6.

Em sua forma mais simples, o programa recebe como parâmetro um endereço IP e uma máscara de rede (netmask) e exibe as informações sobre a rede.

  sipcalc 143.106.1.0/26
  -[ipv4 : 143.106.1.0/26] - 0
  
  [CIDR]
  Host address            - 143.106.1.0
  Host address (decimal)  - 2406088960
  Host address (hex)      - 8F6A0100
  Network address         - 143.106.1.0
  Network mask            - 255.255.255.192
  Network mask (bits)     - 26
  Network mask (hex)      - FFFFFFC0
  Broadcast address       - 143.106.1.63
  Cisco wildcard          - 0.0.0.63
  Addresses in network    - 64
  Network range           - 143.106.1.0 - 143.106.1.63
  Usable range            - 143.106.1.1 - 143.106.1.62

No exemplo acima, o número de bits identificadores da rede (26) foi fornecido na linha de comando. Podemos também usar a notação completa, como abaixo:

  sipcalc 192.168.0.1 255.255.128.0

Neste exemplo, o IP é 192.168.0.1 e a máscara de rede é 255.255.128.0.

Podemos também fornecer múltiplos parâmetros simultaneamente.

  $ sipcalc 192.168.0.1 255.255.128.0 255.255.192.0

Neste exemplo, fornecemos a identificação de uma rede e duas máscaras de rede diferentes.

Outro recurso deste programa é a obtenção dos dados de configuração de uma interface de rede:

  sipcalc eth0
  -[int-ipv4 : eth0] - 0
  
  [CIDR]
  Host address            - 192.168.20.67
  Host address (decimal)  - 2406093891
  Host address (hex)      - 8F6A1443
  Network address         - 192.168.20.64
  Network mask            - 255.255.255.192
  Network mask (bits)     - 26
  Network mask (hex)      - FFFFFFC0
  Broadcast address       - 192.168.20.127
  Cisco wildcard          - 0.0.0.63
  Addresses in network    - 64
  Network range           - 192.168.20.64 - 192.168.20.127
  Usable range            - 192.168.20.65 - 192.168.20.126

E ainda, podemos obter informação sobre um determinado domínio:

  sipcalc -d www.dicas-l.com.br
  -[ipv4 : www.dicas-l.com.br] - 0
  
  [CIDR]
  Host address            - 208.115.203.102
  Host address (decimal)  - 3497249638
  Host address (hex)      - D073CB66
  Network address         - 208.115.203.102
  Network mask            - 255.255.255.255
  Network mask (bits)     - 32
  Network mask (hex)      - FFFFFFFF
  Broadcast address       - 208.115.203.102
  Cisco wildcard          - 0.0.0.0
  Addresses in network    - 1
  Network range           - 208.115.203.102 - 208.115.203.102

E também funciona para endereços ipv6:

  sipcalc 2001:0db8:85a3:0000:0000:8a2e:0370:7334
  -[ipv6 : 2001:0db8:85a3:0000:0000:8a2e:0370:7334] - 0
  
  [IPV6 INFO]
  Expanded Address        - 2001:0db8:85a3:0000:0000:8a2e:0370:7334
  Compressed address      - 2001:db8:85a3::8a2e:370:7334
  Subnet prefix (masked)  - 2001:db8:85a3:0:0:8a2e:370:7334/128
  Address ID (masked)     - 0:0:0:0:0:0:0:0/128
  Prefix address          - ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
  Prefix length           - 128
  Address type            - Aggregatable Global Unicast Addresses
  Network range           - 2001:0db8:85a3:0000:0000:8a2e:0370:7334 -
                            2001:0db8:85a3:0000:0000:8a2e:0370:7334

Para instalar o aplicativo sipcalc em sistemas Debian GNU/Linux e derivados, digite:

  sudo apt-get install sipcalc

Piadas IPv6

• The world is moving from IPv4 and going straight to IPv6 because Chuck Norris doesn't like the number 5!
• The bad thing about IPv6 jokes is that nobody wants to tell them first.
• The best part about IPv6 jokes is that you don't have to make up the punchline for 15 years.
• The great thing about Teredo jokes is that you can tell smart jokes even when surrounded by dumb peers.
• The problem with IPv6 jokes is they're long, obscure and no one gets them without a translation.
• I know a great IPv6 joke, but I just don't think you're ready for it.
• An IPv6 packet walks into a bar. Nobody talks to him.
• The great thing about Teredo jokes is that you can tell smart jokes even when surrounded by dumb peers.
• I will tell you IPv6 joke, but first I need to tell you IPv4 joke, so you get it.
• If you run IPv6 then you're a c001:d00d.
• IPv4 is soon dead:beef.

Referências

• Linux Calculating Subnets with ipcalc and sipcalc Utilities
• Command-line Based IP (4/6) Subnet Calculator for Ubuntu Linux - Sipcalc
• IPv6 address
• List of Network Jokes