nentsel - Parent of attribute ?

If i select block's attribut using nentsel the function returns atribute's entity name as a first element of returned list.

How would I then get the name of parent entity - that is the name of the block that contains this attribute?

In help I found this under entnext:

"you can find the parent entity by stepping forward with entnext until a seqend entity is found, then extracting the -2 group from that entity, which is the main entity's name."

But if I step forward using (entnext AttrEntName) i always come to nil...

Can anyone give me an example?

(setq att (car(nentsel "\nSelect attribute")))
(setq parent (cdr(assoc 330 (entget att))))

Works! Thank you very much