87 colors instead of 256

[Aleksey Cheusov]

Hi every one. I'm using rxvt-unicode-9.22. on Linux and NetBSD. Everything is fine except I see only 87 colors instead of 256.
TERM variable may be set to rxvt, rxvt-unicode -- doesn't matter. I see only 87 colors.

Screenshot for the problem is here 

  https://paste.pics/5809E

It is generated by colortest256 script. The following two commands illustrate the problem.

printf '\033[38;5;27m colored text \033[1;0m normal text'
printf '\033[38;5;183m colored text \033[1;0m normal text'

The first one works find and the second doesn't. In xterm and mrxvt both work perfectly.