why dhcpd offer ip always start with .137

I started a dhcpd service, and i find that each time i request a ip, the dhcpd offer ip started with 10.130.52.137 the configration as flowing

root@Hyper:~# cat /pitrix/dvr/rtr-vjp5z8rt_dhcpd.cfg 
authoritative;
ddns-update-style none;
default-lease-time 60;
max-lease-time 60;
option rfc3442-classless-static-routes code 121 = array of integer 8;
option ms-classless-static-routes code 249 = array of integer 8;

subnet 10.130.52.0 netmask 255.255.255.0 {
  range 10.130.52.2 10.130.52.136;
  range 10.130.52.139 10.130.52.254;
  option domain-name-servers 10.16.80.132, 119.29.29.29;
  option domain-search "sh1.qingcloud.com";
  option routers 10.130.52.1;
  option broadcast-address 10.130.52.255;
}

Aug  1 22:46:02 sh1br52n00 dhcpd[7218]: DHCPDISCOVER from 52:54:99:93:f1:d4 via sreebjlo
Aug  1 22:46:03 sh1br52n00 dhcpd[7218]: DHCPOFFER on 10.130.52.137 to 52:54:99:93:f1:d4 (i-cnn6srad) via sreebjlo
Aug  1 22:46:03 sh1br52n00 dhcpd[7218]: DHCPREQUEST for 10.130.52.137 (10.130.52.1) from 52:54:99:93:f1:d4 (i-cnn6srad) via sreebjlo
Aug  1 22:46:03 sh1br52n00 dhcpd[7218]: DHCPACK on 10.130.52.137 to 52:54:99:93:f1:d4 (i-cnn6srad) via sreebjlo