Single website/server unloadable

Starting today, with no known changes to our network, equipment, or service, we're unable to access any sites hosted by our business's web hosting company, for instance tierra-innovation.com and democracyjournal.org The sites are accessible from everywhere else but our office, and the sites are operating normally -- we just can't connect to them through this Comcast service.

This problem occurs only on our network, on all computers and browsers, after a factory reset of the router, with ethernet and wireless connections. We have no local firewall set up, and I turned off the Comcast Wireless Gateway's firewall on the admin page, or at least turned it to "custom."

I got the traceroute results below, but don't know enough to make any sense of them, besides that the connection couldn't be made. Any help's appreciated, as this is an urgent problem.

Traceroute has started…

traceroute to 104.199.118.194 (104.199.118.194), 64 hops max, 72 byte packets
 1  10.1.10.1 (10.1.10.1)  10.545 ms  9.321 ms  1.157 ms
 2  96.120.104.253 (96.120.104.253)  18.418 ms  49.225 ms  69.767 ms
 3  xe-3-1-1-sur02.michiganave.dc.bad.comcast.net (68.87.169.249)  60.381 ms  49.329 ms  29.993 ms
 4  68.85.61.245 (68.85.61.245)  20.215 ms  18.953 ms  11.484 ms
 5  ae-5-0-ar01.capitolhghts.md.bad.comcast.net (68.86.204.205)  18.757 ms  9.788 ms  9.736 ms
 6  te-9-4-ur01.dover.de.bad.comcast.net (68.87.168.61)  11.285 ms  38.106 ms  25.551 ms
 7  be-33657-cr02.ashburn.va.ibone.comcast.net (68.86.90.57)  14.667 ms  19.297 ms  29.701 ms
 8  be-10142-pe01.ashburn.va.ibone.comcast.net (68.86.86.34)  20.605 ms  20.093 ms  20.282 ms
 9  50.242.150.138 (50.242.150.138)  19.844 ms  19.971 ms  19.687 ms
10  * * *
11  108.170.235.112 (108.170.235.112)  30.930 ms  25.905 ms  12.797 ms
12  108.170.240.112 (108.170.240.112)  27.330 ms  16.271 ms  24.703 ms
13  216.239.48.95 (216.239.48.95)  30.003 ms  22.238 ms  29.756 ms
14  209.85.252.46 (209.85.252.46)  40.607 ms  39.996 ms  41.224 ms
15  209.85.247.5 (209.85.247.5)  69.196 ms  60.342 ms  60.154 ms
16  216.239.43.221 (216.239.43.221)  61.377 ms  59.600 ms  61.372 ms
17  209.85.143.214 (209.85.143.214)  59.419 ms  59.929 ms  59.876 ms
18  209.85.143.81 (209.85.143.81)  62.201 ms  59.098 ms  70.061 ms
19  209.85.242.6 (209.85.242.6)  95.871 ms  121.228 ms  88.589 ms
20  209.85.143.71 (209.85.143.71)  90.403 ms  99.912 ms  80.206 ms
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *