I noticed, that syndication.twitter.com has different IP addresses on PING. Is this a reason of unablility to block?
Os sites de alta disponibilidade têm mais de um servidor com suas próprias instâncias. Portanto, eles têm mais de um endereço IP para acessar o site.
A parte complicada é obter uma lista desses endereços IP, porque diferentes servidores DNS podem ser configurados para retornar diferentes endereços IP. Portanto, apenas listar os endereços IP de um servidor DNS normalmente não é suficiente; listar os de alguns servidores DNS é uma aposta mais segura, mas você ainda pode perder uma.
Vá para a Interface da Web Dig e digite syndication.twitter.com na caixa em à esquerda, depois dig .
Observe que pré-selecionei algumas opções para você, uma das quais seleciona os servidores DNS mais comuns. Se você estiver à mão com scripts ou não se importar em pesquisar e fazer perguntas extras, poderá compilar sua própria lista de servidores DNS e reescrever a saída para obter apenas os endereços IP.
É importante notar que esses IPs geralmente residem na mesma sub-rede; Assim, depois de identificar alguns IPs, você pode optar por bloquear toda a sub-rede que os contém. Uma pesquisa reversa de DNS é sua amiga.
Saída:
[email protected] (Default):
dig +noadditional +noquestion +nocomments +nocmd +nostats syndication.twitter.com. @8.8.4.4
syndication.twitter.com. 19 IN A 199.59.148.85
syndication.twitter.com. 19 IN A 199.59.150.46
[email protected] (AT&T (US)):
dig +noadditional +noquestion +nocomments +nocmd +nostats syndication.twitter.com. @165.87.13.129
syndication.twitter.com. 16 IN A 199.16.156.21
syndication.twitter.com. 16 IN A 199.16.156.52
[email protected] (Google):
dig +noadditional +noquestion +nocomments +nocmd +nostats syndication.twitter.com. @8.8.8.8
syndication.twitter.com. 19 IN A 199.59.148.85
syndication.twitter.com. 19 IN A 199.59.150.46
[email protected] (HiNet (TW)):
dig +noadditional +noquestion +nocomments +nocmd +nostats syndication.twitter.com. @168.95.1.1
syndication.twitter.com. 13 IN A 104.244.42.136
syndication.twitter.com. 13 IN A 104.244.42.200
syndication.twitter.com. 13 IN A 104.244.42.72
syndication.twitter.com. 13 IN A 104.244.42.8
[email protected] (OpenDNS):
dig +noadditional +noquestion +nocomments +nocmd +nostats syndication.twitter.com. @208.67.222.222
syndication.twitter.com. 5 IN A 199.16.156.241
syndication.twitter.com. 5 IN A 199.16.157.105
[email protected] (UUNET (CH)):
dig +noadditional +noquestion +nocomments +nocmd +nostats syndication.twitter.com. @195.129.12.122
syndication.twitter.com. 8 IN A 104.244.42.8
syndication.twitter.com. 8 IN A 104.244.42.136
syndication.twitter.com. 8 IN A 104.244.42.72
syndication.twitter.com. 8 IN A 104.244.42.200
[email protected] (UUNET (DE)):
dig +noadditional +noquestion +nocomments +nocmd +nostats syndication.twitter.com. @192.76.144.66
syndication.twitter.com. 30 IN A 104.244.42.200
syndication.twitter.com. 30 IN A 104.244.42.136
syndication.twitter.com. 30 IN A 104.244.42.72
syndication.twitter.com. 30 IN A 104.244.42.8
[email protected] (UUNET (UK)):
dig +noadditional +noquestion +nocomments +nocmd +nostats syndication.twitter.com. @158.43.240.3
syndication.twitter.com. 13 IN A 104.244.42.8
syndication.twitter.com. 13 IN A 104.244.42.200
syndication.twitter.com. 13 IN A 104.244.42.136
syndication.twitter.com. 13 IN A 104.244.42.72
[email protected] (UUNET (US)):
dig +noadditional +noquestion +nocomments +nocmd +nostats syndication.twitter.com. @198.6.100.25
syndication.twitter.com. 16 IN A 199.59.150.46
syndication.twitter.com. 16 IN A 199.59.148.85
[email protected] (Verisign (US)):
dig +noadditional +noquestion +nocomments +nocmd +nostats syndication.twitter.com. @64.6.64.6
syndication.twitter.com. 29 IN A 199.16.156.120
syndication.twitter.com. 29 IN A 199.16.157.105
