diff --git a/files/scripts/updates-uptime-cmd.py b/files/scripts/updates-uptime-cmd.py
index 477bec87f6..7398e70331 100755
--- a/files/scripts/updates-uptime-cmd.py
+++ b/files/scripts/updates-uptime-cmd.py
@@ -97,6 +97,9 @@ conf_fast_width_history = True
 # at their uptime. Only for the main file. Assume they are still up etc.
 conf_dynamic_main_uptime = True
 
+#  How old to consider when machines were created.
+conf_created_dur_def = 0 # Forever
+
 # Hosts that we'll show info. for, by default. info/host cmds.
 conf_important_hosts = ["batcave*", "bastion01*", "noc*"]
 
@@ -913,6 +916,7 @@ def _usage(short=False):
 """ % (prog,), end='')
     if short:
         print("""\
+        created              [duration] [host*]...
         diff/-u              [backup1] [backup2]
         help
         history
@@ -1444,6 +1448,67 @@ def _cmd_uptime(args):
     _max_update_correct('')
     _print_lines('', data)
 
+def _cmd_created(args):
+    age = 0
+    if args.dur > 0:
+        age = args.dur
+
+    hosts = []
+    if hasattr(args, 'hosts'):
+        hosts = args.hosts[:]
+
+    data = fname1()
+    if age > 0: # If a host has been running longer, then ignore it
+        data = filter_uptime_max_datas(data, age)
+    if hosts:
+        data = filter_name_datas(data, hosts)
+
+    hn2h = {} # hostnames to host ... for machine ids
+    for host in data:
+        hn2h[host.name] = host
+
+    hbackups = list(reversed(backups))
+    if len(hbackups) > 1 and _backup_today_identical():
+        hbackups = hbackups[1:]
+
+    rei = set() # (re)installed hosts...
+    dur = 0
+    for backup in hbackups:
+        if age > 0 and age < dur:
+            break
+        dur += 60*60*24 # Broken, but mostly works. Do backups daily, or mtime.
+
+        data = lines2datas(bfname2lines(backup))
+        data = list(sorted(data))
+
+        #  If a machine is missing from an older backup, it's marked as being
+        # (re)installed ... even though it might appear in an even older
+        # backup with the same machine_id. It is what it is.
+        dnames = set(x.name for x in data)
+        for hostname in hn2h:
+            if hostname not in dnames:
+                rei.add(hostname)
+
+        for host in data:
+            if host.name not in hn2h: # Ignore
+                continue
+            if host.name in rei: # Most recent (re)install
+                continue
+
+            if hn2h[host.name].machine_id != host.machine_id:
+                rei.add(host.name)
+            else: # Show the oldest date...
+                hn2h[host.name].date = host.date
+
+    data = []
+    for hostname in rei:
+        data.append(hn2h[hostname])
+    data = sorted(data)
+
+    _max_update(data)
+    _max_update_correct('')
+    _print_lines('', data)
+
 def _diff_hosts(data1, data2, show_both=False, show_utf8=True, skip_eq=False):
     pdata = None
     while len(data1) > 0 or len(data2) > 0:
@@ -1681,6 +1746,17 @@ def _cmd_help(args):
         prog = os.path.basename(sys.argv[0])
     if not args.hcmd:
         _usage()
+    elif args.hcmd in ("created",):
+        print(f"""\
+ Usage: {prog} {args.hcmd} [duration] [host*]
+ 
+ See when machines were (re)installed, can be filtered for creation <= duration.
+
+ Easy way to see new machines.
+
+ Eg. {prog} {args.hcmd} 0 *-test*
+     {prog} {args.hcmd} 5w vmhost* bvmhost* buildhw*
+""", end='')
     elif args.hcmd in ("diff", "diff-u"):
         print(f"""\
  Usage: {prog} diff [backup1] [backup2]
@@ -1926,6 +2002,12 @@ def _main():
 
     # -- Start of the real commands...
 
+    cmd = subparsers.add_parser("created", help="list hosts")
+    cmd.add_argument("dur", nargs='?', default=conf_created_dur_def,
+                     type=_cmdline_arg_duration, help="created within duration")
+    cmd.add_argument("hosts", nargs='*', help="wildcard hostname(s)")
+    __defs(func=_cmd_created)
+
     # diff/diff-u commands
     cmd = subparsers.add_parser("diff", aliases=['diff-u'], help="diff")
     cmd.add_argument("hists", nargs='*', type=_cmdline_arg_hist, help="history file")