Mystic offers local country blocking that works with IPV4 and IPV6.

It uses a local database that exists in the DATA directory. This database is named iplocation.bin and is a free download from the Internet.

Read and note well all the comments in iplocation.txt

                    File: c:\mystic\data\iplocation.txt
; MASTER COUNTRY LOOKUP/BLOCK LIST░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
;
; To block a country, change the first letter from "A" to "B" to block all
; connections from that country.
;
; Be very careful not to mangle the layout of this file.  Each line must
; have either an A or B on the line, followed by 2 letter ISO 3166-1 country
; code followed by the country name.  They must all be separated by two spaces
;
; IP Database must be named "iplocation.bin" in the DATA directory and is a
; free "IP2Location LITE IP-COUNTRY Database" in the "IPV6 BIN" format, which
; can be downloaded from:
;
;    lite.ip2location.com/database/ip-country
;
; Download the proper ZIP and store the ".bin" file contained in the archive
; in your DATA directorty as "iplocation.bin".  An example of the proper
; database filename to download is "IP2LOCATION-LITE-DB1.IPV6.BIN.ZIP"

A  AD  Andorra
A  AE  United Arab Emirates
 Press ESCAPE for Menu                                            Line 1 of 268
 

To enable the country blocking feature, you must also configure it on a per-server basis in the Configure Servers menu. In the example below a TELNET server has had Country Blocking enabled.

      █▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ Server TELNET ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄
      █                                                                     █
      █  Active        │ Yes                                                █
      █  ID            │ TELNET                                             █
      █  Adapter Type  │ IPV4+IPV6                                          █
      █  IPV4 Adapter  │ 0.0.0.0                                            █
      █  IPV6 Adapter  │ ::                                                 █
      █  Port          │ 23                                                 █
      █  Max Allowed   │ 5                                                  █
      █  Auto IP Ban   │ 4  in 120 secs                                     █
      █  Country Block │ Yes                                                █
      █  Send Blocked  │ No                                                 █
      █  Dupe IP Limit │ 1                                                  █
      █                                                                     █
      ▀▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄█