Schlegel (1883) enumerated all regular honeycombs of hyperbolic spaces of three or more dimensions, having finite cells and vertex figures. Coxeter (1954) extended this enumeration to include honeycombs with infinite cells and/or infinite vertex figures, the fundamental region of the symmetry group still being finite. One of these, {4, 4, 3}, was shown to have for its vertices the points whose coordinates are proportional to the integral solutions of a quadratic Diophantine equation (Coxeter & Whitrow 1950). In the present paper, certain quadratic Diophantine equations are found whose solutions provide homogeneous coordinates for the vertices of {6, 3, 3}, {6, 3, 4}, {4, 3, 4, 3} and {3, 4, 3, 3, 3}. A method is also given for finding coordinates for the vertices of the remaining honeycombs (with finite vertex figures), and the simplest of these are listed.