Il DNS (Domain Name System) è uno degli aspetti meno capiti della navigazione su Internet, e visto che più o meno tutti prima o poi hanno problemi con i DNS, i server POP3 o SMTP, ecco una serie di informazioni utili su DNS, indirizzi IP, server POP3 e SMTP. Vedere anche questo articolo.
Una tabella di DNS dei più noti provider italiani:
| Alcuni indirizzi di DNS utili | |
| TIN 195.14.96.135 212.216.172.222 212.216.172.162 194.243.154.51212.216.172.62212.131.30.42 212.216.112.112 195.31.190.31 194.243.154.62 |
Interbusiness 151.99.125.1 151.99.125.3 151.99.125.2 151.99.250.2 |
| Infostrada 193.70.192.100 195.210.91.100 193.70.192.25 193.70.152.25 |
Wind 212.245.255.2 212.245.158.66 212.141.53.123 212.245.158.66 |
| Atlanet 213.234.128.211 213.234.132.130 151.92.2.35 213.199.1.132 |
McLink 195.110.128.1 |
| Flashnet 194.247.160.1 194.247.160.8 |
Albacom 212.17.192.209 |
| I.Net 194.20.8.1 194.20.8.4 |
Elitel 212.34.224.193 212.34.224.132 217.146.65.7 217.146.65.80 |
| Tiscali 195.130.224.18 195.130.225.129 |
Jumpy 212.17.192.216 212.17.192.56 |
| Google 8.8.8.8 8.8.4.4 |
FoolDNS 87.118.111.215 81.174.67.134 |
Un’altra tabella, stavolta di server POP3 e SMTP:
| ISP | DOMINIO | POP3 | SMTP |
| Alice adsl | @alice.it | in.aliceposta.it | out.aliceposta.it |
| Alice clubnet | @aliceposta.it | box.tin.it | mail.tin.it |
| Aruba |
@tuodominio | pop3.aruba.it |
smtp.aruba.it |
| Blu | @blu.it | popmail.blu.it | mail.blu.it |
| Email.it | @Email.it | popmail.email.it | smtp.email.it |
| Fastweb | @fastwebnet.it | pop.fastwebnet.it | smtp.fastwebnet.it |
| Inwind | @inwind.it | popmail.inwind.it | mail.inwind.it |
| Internetlibero | @internetlibero.it | mail.internetlibero.it | smtp.internetlibero.it |
| Iol | @iol.it | popmail.iol.it | mail.iol.it |
| Jumpy | @jumpy.it | pop.jumpy.it | mail.jumpy.it |
| Kataweb.it | @kataweb.it | pop.katamail.com | smtp.katamail.com |
| Libero | @libero.it | popmail.libero.it | mail.libero.it |
| Lycos | @lycos.it | pop.lycos.it | smtp.lycos.it |
| Mclink |
@mclink.it |
mail.mclink.it | mail.mclink.it |
| Poste.it | @poste.it | relay.poste.it |
relay.poste.it |
| Supereva | @supereva.it | mail.supereva.it | mail.supereva.it |
| Tiscali | @tiscali.it | pop.tiscali.it | smtp.tiscali.it |
| Tin | @tin.it | pop.tin.it | smtp.tin.it |
| Virgilio | @virgilio.it | in.virgilio.it | out.virgilio.it |
| Yahoo.it | @yahoo.it | pop.mail.yahoo.it | smtp.mail.yahoo.it |
| Yahoo.com | @yahoo.com | pop.mail.yahoo.com | smtp.mail.yahoo.com |
Altri server DNS
| TIN | Flashnet | ||
| dns1.village.tin.it | 195.14.96.135 | dns.flashnet.it | 194.247.160.1 |
| dnsca2.tin.it | 212.216.172.222 | dns2.flashnet.it | 194.247.160.8 |
| dnscache2.tin.it | 212.216.172.162 | Elitel | |
| dns2.tin.it | 194.243.154.51 | elitel.it | 212.34.224.193 |
| dnscache1.tin.it | 212.216.172.62 | ns.elitel.it | 212.34.224.132 |
| dnsca.tin.it | 212.216.112.112 | ns2.elitel.it | 217.146.65.7 |
| dnsca.tin.it | 195.31.190.31 | ns3.elitel.it | 217.146.65.80 |
| dns.tin.it | 194.243.154.62 | Tiscali | |
| 212.48.4.15 | ns.tiscali.it | 195.130.224.18 | |
| Interbusiness | sns.tiscali.it | 195.130.225.129 | |
| r-dns.interbusiness.it | 151.99.125.1 | 213.305.32.70 | |
| dns2.interbusiness.it | 151.99.125.3 | 213.205.36.70 | |
| dns.interbusiness.it | 151.99.125.2 | Atlanet | |
| server-b.cs.interbusiness.it | 151.99.250.2 | ns1.atlanet.it | 213.234.128.211 |
| Libero | ns2.atlanet.it | 213.234.132.130 | |
| ns2.libero.it | 193.70.192.100 | ns1.its.it | 151.92.2.35 |
| ns1.libero.it | 195.210.91.100 | ns.telexis.it | 213.199.1.132 |
| cns-a.libero.it | 193.70.192.25 | McLink | |
| cns-b.libero.it | 193.70.152.25 | dns.mclink.it | 195.110.128.1 |
| Fastweb | Wind | ||
| 213.140.2.12 | dns.wind.it | 212.245.255.2 | |
| 213.140.2.21 | dns2.wind.it | 212.245.158.66 | |
| 213.140.2.43 | dns.inwind.it | 212.141.53.123 | |
| 213.140.2.49 | dns2.wind.it | 212.245.158.66 | |
| Opendns | Caltanet | ||
| 208.67.222.222 | 192.106.1.1 | ||
| 208.67.220.220 | 195.210.91.104 | ||
| Eutelia | Interbusiness | ||
| 62.94.0.1 | 151.99.250.2 | ||
| 62.94.0.2 | 151.99.125.2 | ||
| DNS pubblici | Urano | ||
| dns.nic.it | 193.205.245.5 | 194.20.8.1 | |
| dns2.nic.it | 193.205.245.8 | 194.20.8.4 | |
| nameserver.cnr.it | 194.119.192.34 | ||
una lista di DNS non censurati
| dns2.de.net – 194.246.96.49 (Frankfurt, Germany) |
ns1.de.eu.orsn.net – 217.146.139.5 (Hildesheim, Germany) |
| resolver.netteam.de – 193.155.207.61 (Alfter-Impekoven, Germany) |
sunic.sunet.se – 192.36.125.2 (Stockholm, Sweden) |
| master.ns.dns.be – 193.109.126.140 (Leuven, Belgium) |
ns1.lu.eu.orsn.net – 195.206.104.98 (Belvaux, Luxembourg) |
| merapi.switch.ch – 130.59.211.10 (Zurich, Switzerland) |
prades.cesca.es – 192.94.163.152 (Barcelona, Spain) |
| michael.vatican.va – 212.77.0.2 (Vatican City, Italy) |
dns.inria.fr – 193.51.208.13 (Nice, France) |
| ns0.ja.net – 128.86.1.20 (London, UK) |
nic.aix.gr – 195.130.89.210 (Athens, Greece) |
| ns.ati.tn – 193.95.66.10 (Tunis, Tunisia) |
ns1.relcom.ru – 193.125.152.3 (Moscow, Russia) |
| trantor.umd.edu – 128.8.10.14 (College Park, MD, USA) |
ns1.berkeley.edu – 128.32.136.9 (Berkeley, CA, USA) |
| merle.cira.ca – 64.26.149.98 (Ottawa, Canada) |
ns2.dns.br – 200.19.119.99 (Sao Paulo, Brasil) |
| ns2.gisc.cl – 200.10.237.14 (Santiago, Chile) |
ns.uvg.edu.gt – 168.234.68.2 (Guatemala, Guatemala) |
| ns1.retina.ar – 200.10.202.3 (Buenos Aires, Argentina) |
ns.unam.mx – 132.248.253.1 (Mexico City, Mexico) |
| ns.wide.ad.jp – 203.178.136.63 (Osaka, Japan) |
ns.twnic.net – 192.83.166.11 (Taipei, Taiwan) |
| ns3.dns.net.nz – 203.97.8.250 (Wellington, New Zealand) |
box2.aunic.net – 203.202.150.20 (Melbourne, Australia) |
un po’ di DNS USA:
| nsphil.bellatlantic.net IP address: 151.197.0.38 |
home4.bellatlantic.net IP address: 151.197.0.39 |
| nyc1-qwest.bellatlantic.net IP address: 151.202.0.84 |
nyc2-qwest.bellatlantic.net IP address: 151.202.0.85 |
| nyc1-gtei.bellatlantic.net IP address: 141.155.0.84 |
nyc2-gtei.bellatlantic.net IP address: 141.155.0.85 |
| boston1-qwest.bellatlantic.net IP address: 151.203.0.84 |
boston2-qwest.bellatlantic.net IP address: 151.203.0.85 |
| boston1-gtei.bellatlantic.net IP address: 141.154.0.84 |
boston2-gtei.bellatlantic.net IP address: 141.154.0.85 |
| ns.bellatlantic.net IP address: 199.45.32.37 |
ns1.bellatlantic.net IP address: 199.45.32.40 |
| ns2.bellatlantic.net IP address: 151.202.0.85 |
vzdns01.verizon.com IP address: 192.76.85.133 |
| dnsauth1.sys.gtei.net IP address: 4.2.49.2 |
dnsauth2.sys.gtei.net IP address: 4.2.49.3 |
| dnsauth3.sys.gtei.net IP address: 4.2.49.4 |
dnspri.sys.gtei.net IP address: 4.2.35.8 |
| ns1.qwest.net IP address: 216.111.65.217 |
ns2.qwest.net IP address: 205.171.16.250 |
| ns3.qwest.net IP address: 63.226.138.15 |
SVL-ANS-01.INET.qwest.net IP address: 205.171.14.195 |
| DCA-ANS-01.INET.qwest.net IP address: 205.171.9.242 |
Verizon server 4.2.2.1 Default Server: vnsc-pri.sys.gtei.net Address: 4.2.2.1 |
| Verizon server 4.2.2.2 Default Server: vnsc-bak.sys.gtei.net Address: 4.2.2.2 |
Verizon server 4.2.2.3 Default Server: vnsc-lc.sys.gtei.net Address: 4.2.2.3 |
| nsdc.bellatlantic.net IP address: 199.45.32.38 |
Official name: home1.bellatlantic.net IP address: 199.45.32.43 |
Interessante infine un servizio gratuito chiamato Tunlr, che crea una VPN al volo ri-imbustando i pacchetti che figurano arrivare dagli USA, consentendo così l’accesso a servizi region-blocked:
Gli indirizzi IP del DNS di Tunlr sono:
142.54.177.158
e
198.147.22.212
Visitando questo indirizzo si può testare se il servizio è attivo.