dcc servers is filtered

Dear Sir or Madam!

I have been using dcc with SA.

I notice that dcc does not work.
I made some tests and I find out that dcc servers filtered.
My route is 213.129.96/19
My AS is 24923
Compane Transtelecom
Can you help me with that problem and why the servers are filtered?

Your faithfully,
Valery
E-mail vb@uvttk.ru
http://www.uvttk.ru

Starting nmap 3.30 ( http://www.insecure.org/nmap/ ) at 2006-10-29 21:36 MSK
The first host is 64, and the last one is 64
The first host is 124, and the last one is 124
The first host is 52, and the last one is 52
The first host is 232, and the last one is 232
Host z.dcc-servers.net (64.124.52.232) appears to be up ... good.
Starting pos_scan (Connect() Scan)
Initiating Connect() Scan against z.dcc-servers.net (64.124.52.232) at 21:36
Finished round #1. Current stats: numqueries_ideal: 30; min_width: 1;
max_width:
3876; packet_incr: 4; senddelay: 0us; fallback: 70%
Finished round #2. Current stats: numqueries_ideal: 30; min_width: 1;
max_width:
3876; packet_incr: 4; senddelay: 0us; fallback: 70%
The Connect() Scan took 36 seconds to scan 1 ports.
Interesting ports on z.dcc-servers.net (64.124.52.232):
Port State Service
21/tcp filtered ftp
Final times for host: srtt: -1 rttvar: -1 to: 6000000

Nmap run completed -- 1 IP address (1 host up) scanned in 51.494 seconds 
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