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The angels throughout Scripture are often described in the masculine form. For example, they are depicted as men when mentioned in Holy Scripture with regards to who they are, these angels are often put in the masculine gender.
So while the Scripture doesn't overtly say that the angels are all males but alludes to this fact for all referenced angel appearances in the Bible are in the male gender.
It's also interesting that in the book of Genesis, when the scriptures describe the situation in the time of Noah, it shares that the sons of God went in with the daughters of men, illustrating that these angels who had interactions with the daughters of men were, in fact, male, or the male gender.
Of course, they gave rise to a race of giants, which, of course, would allude to the fact that these fallen angels were of the male gender for them to be able to procreate with the daughters of men or with women.
Now do we know exactly the gender? All indications would show that those angels would be of the male gender.
Of course, they are not human. When they do come in human form or in physical form, they show up as males and the interesting here is that God is Spirit, but when He shows up in physical form, shows up as a Man, The Lord, Christ Jesus, and He's referred to in the masculine gender.
So it follows likewise, that the angels, even though they're ministering spirits, when they come in human form, are in the male gender.