sS ipToCountry_dataSnippet = #1008743;

static NavigableMap<Long, S> ipToCountry_data = new TreeMap; //synchroNavigableTreeMap();
static Lock ipToCountry_lock = lock();

static S ipToCountry_old(S ip) null on exception {
  long ipNum = ipToInt(trim(ip));
  lock ipToCountry_lock;
  ipToCountry_init();
  Long key = ipToCountry_data.floorKey(ipNum);
  ret key == null ? null : ipToCountry_data.get(key);
}

static void ipToCountry_init() {
  lock ipToCountry_lock;
  if (nempty(ipToCountry_data)) ret;
    
  long start = 0;
  for (S s : linesFromReader(utf8bufferedReader(gzInputStream(loadLibrary(ipToCountry_dataSnippet))))) {
    L<S> l = splitAtSpace(s);
    if (l(l) < 2) continue;
    long diff = parseLong(first(l));
    S country = intern(last(l));
    start += diff;
    ipToCountry_data.put(start, country);
  }
}

static void ipToCountry_clearCache() {
  lock ipToCountry_lock;
  ipToCountry_data.clear();
}

Began life as a copy of #1008738