All of these name servers are unreachable via Comcast. I have truncated the returns for brevity. The first IP, 78.129.205.47 was assigned to me and then blocked by Comcast. I terminated that site and got a new site and was assigned IP 78.129.205.50 and that IP is blocked as of 5 February 2018. I have subsequently engaged CloudFlare and have no issues other than connecting via FTP software. However, the above listed Name Servers of Altervista are not reachable. Comcast is a major player in Internet service and to have altervista blocked is not good form. Moreover, since 78.129.205.50 is blocked, I cannot connect to ftp.legionpost869.altervista.org via my FTP software and Dreamweaver.
Microsoft Windows [Version 10.0.16299.192]
(c) 2017 Microsoft Corporation. All rights reserved.
C:\Users\xxx>tracert ns355.altervista.org
Tracing route to ns355.altervista.org [78.129.205.47]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms 192.168.123.254
2 9 ms 9 ms 8 ms 96.120.8.157
3 9 ms 9 ms 9 ms te-0-1-0-14-sur03.scranton.pa.pitt.comcast.net [162.151.68.21]
4 13 ms 15 ms 14 ms be-49-ar01.lancaster.pa.pitt.comcast.net [96.108.4.237]
5 * * * Request timed out.
6 * * * Request timed out.
7 * * * Request timed out.
30 * * * Request timed out.
Trace complete.
C:\Users\xxx>tracert ns352.altervista.org (Note: ns42 uses the same IP as n2352)
Tracing route to ns352.altervista.org [78.129.205.50]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms 192.168.123.254
2 10 ms 8 ms 16 ms 96.120.8.157
3 10 ms 8 ms 8 ms te-0-1-0-14-sur03.scranton.pa.pitt.comcast.net [162.151.68.21]
4 14 ms 14 ms 13 ms be-49-ar01.lancaster.pa.pitt.comcast.net [96.108.4.237]
5 * * * Request timed out.
6 * * * Request timed out.
30 * * * Request timed out.