¿Cómo saber a quién pertenece esa IP desde la que te están mandando spam o saturando tu blog? Hay muchas formas de saberlo, existen bases de datos que contienen los rangos de IPs que corresponden a cada proveedor y se puede descargar en un pequeño archivo de texto para consultarlo.
El archivo es demasiado extenso para ser publicado aquí, pero se puede descargar actualizado del ftp de Ripe.net.
Ahí van las IPs de algunos proveedores y entidades españolas:
es.arsys
ARSYS INTERNET S.L.
20031222 82.223/16 ALLOCATED PA
20001128 217.76.128/20 ALLOCATED PA
20021007 217.76.144/20 ALLOCATED PA
20030326 2001:0ba0::/32
es.euskaltel
Euskaltel
20010618 62.99/17 ALLOCATED PA
20030717 82.130.128/17 ALLOCATED PA
20040322 83.213/16 ALLOCATED PA
20041022 85.84/14 ALLOCATED PA
19990702 212.8.64/18 ALLOCATED PA
19980403 212.55/19 ALLOCATED PA
20000818 212.142.128/17 ALLOCATED PA
es.jazztel
Jazz Telecom S.A.
19991202 62.14/16 ALLOCATED PA
20000720 62.15/16 ALLOCATED PA
20050607 87.216/13 ALLOCATED PA
19990507 212.106.192/19 ALLOCATED PA
20000609 212.106.224/19 ALLOCATED PA
es.knet
Knet Comunicaciones, S.L.
20031128 82.199.32/19 ALLOCATED PA
es.ono
ONO
20000503 62.42/16 ALLOCATED PA
20001106 62.43/16 ALLOCATED PA
20021112 81.202/15 ALLOCATED PA
20040415 84.120/13 ALLOCATED PA
19990519 212.95.192/19 ALLOCATED PA
19991117 212.122.96/19 ALLOCATED PA
19991122 213.201/17 ALLOCATED PA
es.rediris
Departamento RedIRIS, Entidad publica empresarial RED.ES
19940802 193.144/15 ALLOCATED PA
19940802 193.146/16 ALLOCATED PA
19960202 193.147/16 ALLOCATED PA
19981028 212.128.0/16 ALLOCATED PA
20010521 2001:0720::/35
20020709 2001:0720:2000::/35
20020709 2001:0720:4000::/34
20020709 2001:0720:8000::/33
es.retevision
Retevision S.A.
19980330 62.81/16 ALLOCATED PA
19990504 62.82/16 ALLOCATED PA
20000211 62.83/16 ALLOCATED PA
20000822 62.174/15 ALLOCATED PA
20010928 80.224/16 ALLOCATED PA
20021212 81.60/15 ALLOCATED PA
20060213 89.140/15 ALLOCATED PA
19991005 194.106.0/19 ALLOCATED PA
19991005 194.149.192/19 ALLOCATED PA
es.telefonica
TELEFONICA DE ESPANA
20010709 80.24/15 ALLOCATED PA
20011112 80.32/13 ALLOCATED PA
20010613 80.58/15 ALLOCATED PA
20020215 81.32/12 ALLOCATED PA
20031202 83.32/12 ALLOCATED PA
20041007 83.48/12 ALLOCATED PA
20050713 88/11 ALLOCATED PA
20000301 213.96/15 ALLOCATED PA
20000517 213.98/16 ALLOCATED PA
20010307 217.125/16 ALLOCATED PA
20010307 217.126/15 ALLOCATED PA
20021108 2001:09d8::/32
es.ttd
TELEFONICA DATA ESPANA
20010709 80.26/15 ALLOCATED PA
20010709 80.28/14 ALLOCATED PA
19971120 193.152/15 ALLOCATED PA
19961204 194.69.224/19 ALLOCATED PI
19951020 194.179.0/17 ALLOCATED PA
19951222 194.224/16 ALLOCATED PA
19961219 195.53/16 ALLOCATED PA
19961219 195.55/16 ALLOCATED PA
19961219 195.57/16 ALLOCATED PA
19960610 195.76/16 ALLOCATED PA
19961202 195.77/16 ALLOCATED PA
19971208 195.235/16 ALLOCATED PA
19990225 212.170/16 ALLOCATED PA
19990527 213/16 ALLOCATED PA
19990809 213.4/16 ALLOCATED PA
20000517 213.99/16 ALLOCATED PA
20010307 217.124/16 ALLOCATED PA
20020705 2001:0800::/32
es.yacom
Ya.com Internet Factory
20001121 62.151/16 ALLOCATED PA
20040423 84.76/14 ALLOCATED PA
20060117 89.128/14 ALLOCATED PA
y continuando, la lista completa para España:
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