Range IP scan with option -sn show wrong result.

Hi Folks,

I've some problem with scanning host with nmap using format:
192.168.100.70-71 or 192.168.100.70,71 or 192.168.100.70-71,100

root:~# uname -smr
FreeBSD 9.3-STABLE i386

root:~# nmap -v

Starting Nmap 7.40 ( https://nmap.org ) at 2017-07-05 12:18 WIB
Read data files from: /usr/local/share/nmap
WARNING: No targets were specified, so 0 hosts scanned.
Nmap done: 0 IP addresses (0 hosts up) scanned in 0.10 seconds
           Raw packets sent: 0 (0B) | Rcvd: 0 (0B)

Here's an example I've done:

root:~# nmap -sn 192.168.100.70-71

Starting Nmap 7.40 ( https://nmap.org ) at 2017-07-05 12:23 WIB
Nmap scan report for ip.wifi-ap1.willsz.net (192.168.100.70)
Host is up (0.00021s latency).
MAC Address: 60:E3:27:BC:CC:76 (Tp-link Technologies)
Nmap done: 2 IP addresses (1 host up) scanned in 0.33 seconds

Output nmap only resulting 1 host UP, but actualy host .70 and .71 already
UP:

root:~# nmap -sn 192.168.100.70

Starting Nmap 7.40 ( https://nmap.org ) at 2017-07-05 12:23 WIB
Nmap scan report for ip.wifi-ap1.willsz.net (192.168.100.70)
Host is up (0.00016s latency).
MAC Address: 60:E3:27:BC:CC:76 (Tp-link Technologies)
Nmap done: 1 IP address (1 host up) scanned in 0.22 seconds

root:~# nmap -sn 192.168.100.71

Starting Nmap 7.40 ( https://nmap.org ) at 2017-07-05 12:23 WIB
Nmap scan report for ip.wifi-ap2.willsz.net (192.168.100.71)
Host is up (0.00025s latency).
MAC Address: 10:FE:ED:94:81:A9 (Tp-link Technologies)
Nmap done: 1 IP address (1 host up) scanned in 0.22 seconds

This problem same with other format too:

root:~# nmap -sn 192.168.100.70-71,100

Starting Nmap 7.40 ( https://nmap.org ) at 2017-07-05 12:26 WIB
Nmap scan report for pcbill.willsz.net (192.168.100.100)
Host is up (0.000091s latency).
MAC Address: 00:30:67:56:75:BF (Biostar Microtech Int'l)
Nmap done: 3 IP addresses (1 host up) scanned in 0.33 seconds

Would you give clue to fix this bug?

Thank you.

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