Hi folks. Can someone tell Me max.dexterity for boots under lvl 30.

I think it should be 5, otherwise 9 but it would required lvl 30+

Depends on the suffix. Looks like it should be 3 max dex with a max level req of 13 if the suffix is "dexterity".

If you get the 3-5 dex suffix of "skill" then the level req will be 34. But the 3 dex from the skill suffix doesn't apply to boots.

Arreat summit does show all of this information.

+ Dexterity
(Precision for Body Armor(60) and Boots(60) can only spawn on Magical versions of these items)
Available on
Dexterity +1-3 to Dexterity Amulets(2)[1-2], Bows(2)[1-2], Circlets(2)[1-2], Crossbows(2)[1-2], Gloves(1-12)[1](6)[1-2], Rings(1-5)[1](6)[1-2], Body Armor(13)[2-3], Boots(1-12)[1](13)[2-3]
Skill +3-5 to Dexterity Amulets(11)[3-5], Bows(11)[3-5], Circlets(11)[3-5], Crossbows(11)[3-5], Gloves(22)[3-5], Rings(22)[3-5], Body Armor(34)[4-5], Boots(34)[4-5]
Accuracy +6-9 to Dexterity Amulets(27), Bows(27), Circlets(27), Crossbows(27), Gloves(39), Rings(39), Body Armor(46), Boots(46)
Precision +10-15 to Dexterity Amulets(43), Bows(43), Circlets(43), Crossbows(43), Gloves(56), Rings(56), Body Armor(60), Boots(60)
Perfection +16-20 to Dexterity Amulets(59), Bows(59), Circlets(59), Crossbows(59), Gloves(75), Rings(75)
Nirvana +21-30 to Dexterity Amulets(72), Bows(72), Circlets(72), Crossbows(72)

https://classic.battle.net/diablo2exp/items/magic/suf.shtml

The only information you want to see is this, I've expanded the meanings of the numbers as well:
Dexterity +1-3 to Dexterity Boots (level req 1-12)[1 dex] or (level req 13)[2-3 dex]
Skill +3-5 to Dexterity Boots (level req 34)[4-5 dex]

your interpretation of the numbers is wrong though. numbers in square brackets represent ilvl, the rlvl is 75% of this number
34*0.75=25.5 (rounded down to 25), so with level 30 boots can spawn with 5 dex

Got it mate. So i found a decent roll lld boots. 4 dex out of 5