WHY PING Request timed out

C:\Documents and Settings\Administrator>ping niunm.bplaced.ne

Pinging niunm.bplaced.net [88.198.5.226] with 32 bytes of dat

Control-C
^C
C:\Documents and Settings\Administrator>ping njwyj2.bplaced.n

Pinging njwyj2.bplaced.net [78.46.37.17] with 32 bytes of dat

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 78.46.37.17:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Documents and Settings\Administrator>ping 88.198.5.226

Pinging 88.198.5.226 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 88.198.5.226:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

[code]$ ping njwyj2.bplaced.net
PING njwyj2.bplaced.net (78.46.37.17) 56(84) bytes of data.
64 bytes from server2.bplaced.net (78.46.37.17): icmp_seq=1 ttl=57 time=49.9 ms
64 bytes from server2.bplaced.net (78.46.37.17): icmp_seq=2 ttl=57 time=48.1 ms
64 bytes from server2.bplaced.net (78.46.37.17): icmp_seq=3 ttl=57 time=47.3 ms
64 bytes from server2.bplaced.net (78.46.37.17): icmp_seq=4 ttl=57 time=48.3 ms

njwyj2.bplaced.net ping statistics —
4 packets transmitted, 4 received, 0% packet loss, time 2999ms
rtt min/avg/max/mdev = 47.314/48.430/49.983/1.007 ms[/code]

[code]$ ping niunm.bplaced.net
PING niunm.bplaced.net (88.198.5.226) 56(84) bytes of data.
64 bytes from server7.bplaced.net (88.198.5.226): icmp_seq=1 ttl=57 time=48.2 ms
64 bytes from server7.bplaced.net (88.198.5.226): icmp_seq=2 ttl=57 time=47.1 ms
64 bytes from server7.bplaced.net (88.198.5.226): icmp_seq=3 ttl=57 time=46.1 ms
64 bytes from server7.bplaced.net (88.198.5.226): icmp_seq=4 ttl=57 time=47.7 ms

niunm.bplaced.net ping statistics —
4 packets transmitted, 4 received, 0% packet loss, time 2999ms
rtt min/avg/max/mdev = 46.150/47.347/48.293/0.836 ms[/code]

Firewall maybe?