curl -s http://public-dns.info/nameserver/pl.csv > list; cat list | cut -d "," -f1 | \
xargs -i timeout 1 ping -c1 -w 1 {} | grep time | \
sed -u "s/.* from \([^:]*\).*time=\([^ ]*\).*/\2\t\1/g" | grep -v "1 packets" | sort -n

Więcej informacji: DNS servers in Poland

1. Google:
– 8.8.8.8, 8.8.4.4
2. OpenDNS:
– 208.67.220.220, 208.67.222.222
3. Norton ConnectSafe:
– 199.85.126.10, 199.85.127.10
4. Comodo Secure DNS:
– 8.26.56.26, 8.20.247.20
5. DNS.Watch:
– 84.200.69.80, 84.200.70.40
6. VeriSign Public DNS:
– 64.4.64.6, 64.6.65.6