$ perl -le'use charnames (); use warnings; no warnings "utf8"; chr($_)=~/[\p{Zs}]/ && printf "%.4x: %s\n", $_, charnames::viacode($_) for 0..65500'
0020: SPACE
00a0: NO-BREAK SPACE
1680: OGHAM SPACE MARK
180e: MONGOLIAN VOWEL SEPARATOR
2000: EN QUAD
2001: EM QUAD
2002: EN SPACE
2003: EM SPACE
2004: THREE-PER-EM SPACE
2005: FOUR-PER-EM SPACE
2006: SIX-PER-EM SPACE
2007: FIGURE SPACE
2008: PUNCTUATION SPACE
2009: THIN SPACE
200a: HAIR SPACE
202f: NARROW NO-BREAK SPACE
205f: MEDIUM MATHEMATICAL SPACE
3000: IDEOGRAPHIC SPACE