ipdiscover class A network

I have a class a network with a lot of systems to scan with ipdiscover. I know class a network is bat to use with ipdiscover, but is unchangeable. My problem is that the result is not complete. I use a computer with windows agent and option IPDISCOVER: 101.0.0.0. The scan starts and I get a lot of computer between 101.0.0.0 and 101.0.0.254:

    IPDISCOVER => Computer found @IPv4:101.0.0.62 @MAC:00:79:64:80:00:EA NAME:blabla

After the scan is finished this message appeard in the log file:

    IPDISCOVER => NETWORK scan finished, 49 hosts found, 65535 scanned

But this is not correct. I have for example a lots of computer and other systems between 101.1.1.0 and 101.1.1.254. If I use nmap like:

nmap -sP 101.0.0.0/8

the scan is running and after long time i got all my systems like:

Nmap scan report for blabla (101.2.4.228)

I tried to scan subnets manually like:

OCSInventory.exe /debug=2 /notag /force /np /server=http://ocsng/ocsinventory /ipdisc="101.0.0.1-254" /ipdisc_lat="2"

AGENT => IpDiscover required by /IPDISC on network 101.0.0.1-254
    AGENT => IpDiscover Latency forced by /IPDISC_LAT to 2
ERROR *** IPDISCOVER => No mask is available for the given network number:

OCSInventory.exe /debug=2 /notag /force /np /server=http://ocsng/ocsinventory /ipdisc="101.0.0.0/24" /ipdisc_lat="2"

AGENT => IpDiscover required by /IPDISC on network 101.0.0.0/24
    AGENT => IpDiscover Latency forced by /IPDISC_LAT to 2
ERROR *** IPDISCOVER => No mask is available for the given network number:

OCSInventory.exe /debug=2 /notag /force /np /server=http://ocsng/ocsinventory /ipdisc="101.0.0.0/255.255.255.0" /ipdisc_lat="2"

AGENT => IpDiscover required by /IPDISC on network 101.0.0.0/255.255.255.0
    AGENT => IpDiscover Latency forced by /IPDISC_LAT to 2
ERROR *** IPDISCOVER => No mask is available for the given network number:

Also I tryed to add sub nets and to change TVALUE = 101.1.0.0 at the database table 'devices'. No success.

Has anyone a suggestion?

ipconfig /all

IPv4-Adresse  . . . . . . . . . . : 101.2.4.228(Bevorzugt)
Subnetzmaske  . . . . . . . . . . : 255.0.0.0

Test:

C:\Program Files (x86)\OCS Inventory Agent>OCSInventory.exe /debug=2 /notag /force /np /server=http://ocsng/ocsinventory /ipdisc="101.0.0.0" /ipdisc_lat="2"

Output LOG: C:\ProgramData\OCS Inventory NG\Agent

==============================================================================
Starting OCS Inventory NG Agent on Thursday, November 10, 2016 11:12:10.
AGENT => Running OCS Inventory NG Agent Version 2.1.1.3
AGENT => Using OCS Inventory NG FrameWork Version 2.1.1.3
AGENT => Loading plug-in(s)
    DLL PLUGIN => Searching for Plug-in DLL(s) in folder <C:\Program Files (x86)\OCS Inventory Agent\plugins>
    DLL PLUGIN => 0 DLL Plug-in(s) successfully loaded on 0 DLL(s) found
AGENT => Using network connection with Communication Server
    COM PROVIDER => Loading Communication Provider <C:\Program Files (x86)\OCS Inventory Agent\ComHTTP.dll>
AGENT => Using Communication Provider <OCS Inventory NG cURL Communication Provider> Version <2.1.1.3>
AGENT => Sending Prolog
    DID_CHECK => Read DeviceID <MAIK-2014-11-24-13-35-10> and MACs <A0:C2:C1:47:63:8B> in file <ocsinventory.dat>
    COM SERVER => Initializing cURL library for sendRequest
    COM SERVER => Using cURL without server authentication
    COM SERVER => Disabling cURL proxy support
    COM SERVER => Disabling cURL SSL server validation support
    COM SERVER => Sending HTTP Post request to URL <http://ocsng/ocsinventory>
    COM SERVER => HTTP Post response received <HTTP Status Code #200>
    COM SERVER => Cleaning cURL library
================= TRACE START ===============
<?xml version='1.0' encoding='UTF-8'?>
<REPLY>
  <RESPONSE>SEND</RESPONSE>
  <INVENTORY_ON_STARTUP>1</INVENTORY_ON_STARTUP>
  <PROLOG_FREQ>24</PROLOG_FREQ>
  <OPTION>
    <PARAM IPDISC_LAT="100">101.0.0.0</PARAM>
    <NAME>IPDISCOVER</NAME>
  </OPTION>
  <OPTION>
    <PARAM ON="1" TYPE="CONF" EXECUTION_TIMEOUT="120" FRAG_LATENCY="10" PERIOD_LENGTH="10" CYCLE_LATENCY="60" PERIOD_LATENCY="1" TIMEOUT="30" />
    <NAME>DOWNLOAD</NAME>
  </OPTION>
</REPLY>

================= TRACE STOP ===============
AGENT => Prolog successfully sent
SUPPORT => No support detected, Registration key : N/A
    AGENT => Prolog Frequency set to 24 hour(s)
AGENT => Inventory forced by /FORCE option
AGENT => Launching hardware and software checks
...
AGENT =>  Communication Server ask for Registry Query
    REGISTRY => Executing query asked by server
    REGISTRY => 3 query successfully executed
AGENT => IpDiscover required by /IPDISC on network 101.0.0.0
    AGENT => IpDiscover Latency forced by /IPDISC_LAT to 2
    IPDISCOVER => Scanning to detect IPv4 enabled hosts for network <101.0.0.0> with <2> ms between each request
    IPDISCOVER => Computer found @IPv4:101.0.0.14 @MAC:00:50:56:84:2D:63 NAME:erased_manually
    IPDISCOVER => Computer found @IPv4:101.0.0.29 @MAC:80:EE:73:BE:92:5C NAME:erased_manually
...
    IPDISCOVER => Computer found @IPv4:101.0.0.24 @MAC:00:0A:83:00:5E:2B NAME:101.0.0.24
    IPDISCOVER => Computer found @IPv4:101.0.0.180 @MAC:00:C0:EE:58:57:57 NAME:101.0.0.180
    IPDISCOVER => Waited 3180 ms for the threads to die
    IPDISCOVER => NETWORK scan finished, 49 hosts found, 65535 scanned
    EXECUTABLE PLUGIN => Searching for VBS script(s) in folder <C:\Program Files (x86)\OCS Inventory Agent\plugins>
    EXECUTABLE PLUGIN => Searching for executable(s) in folder <C:\Program Files (x86)\OCS Inventory Agent\plugins>
AGENT => Sending Inventory
    INVENTORY => Checking last inventory state
    INVENTORY => Logical drives inventory state changed
INVENTORY => Inventory changed since last run
...
================= TRACE START ===============
<?xml version='1.0' encoding='UTF-8'?>
<REPLY>
  <RESPONSE>NO_ACCOUNT_UPDATE</RESPONSE>
</REPLY>

================= TRACE STOP ===============