if you have list for example

124.248.211.117:443
118.70.129.101:8080
122.116.118.201:3128
190.12.86.211:3128

you have to add
**External links are only visible to Support Staff**
to the begining of the each line (you could do it with regexp text editor or spreadsheet editor
the result mus be

**External links are only visible to Support Staff****External links are only visible to Support Staff**
**External links are only visible to Support Staff****External links are only visible to Support Staff**
**External links are only visible to Support Staff****External links are only visible to Support Staff**
**External links are only visible to Support Staff****External links are only visible to Support Staff**