\begin{figure} \begin{tabular}{c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c } \texttt{\tiny{0}} &\texttt{\tiny{1}} & \texttt{\tiny{2}} & \texttt{\tiny{3}} & \texttt{\tiny{4}} & \texttt{\tiny{5}} & \texttt{\tiny{6}} & \texttt{\tiny{7}} & \texttt{\tiny{8}} & \texttt{\tiny{9}} & \texttt{\tiny{0}} & \texttt{\tiny{1}} & \texttt{\tiny{2}} & \texttt{\tiny{3}} & \texttt{\tiny{4}} & \texttt{\tiny{5}} & \texttt{\tiny{6}} & \texttt{\tiny{7}} & \texttt{\tiny{8}} & \texttt{\tiny{9}} & \texttt{\tiny{0}} & \texttt{\tiny{1}} & \texttt{\tiny{2}} & \texttt{\tiny{3}} & \texttt{\tiny{4}} & \texttt{\tiny{5}} & \texttt{\tiny{6}} & \texttt{\tiny{7}} & \texttt{\tiny{8}} & \texttt{\tiny{9}} & \texttt{\tiny{0}} & \texttt{\tiny{1}} \\ \hline \multicolumn{number of bits here}{|c|}{content of the field here} & \multicolumn{number of bits here}{|c|}{content of the field here} & \multicolumn{number of bits here}{|c|}{content of the field here} & \multicolumn{number of bits here}{|c|}{content of the field here} \\ \hline \multicolumn{32}{|c|}{this field is one row} \\ \hline \multicolumn{32}{|c|}{this field continues to the next row} \\ \cline{9-32} \multicolumn{8}{|c|}{rest of the field started above} & \multicolumn{7}{|c}{} & \multicolumn{1}{c|}{1} & \multicolumn{8}{|c|}{length: 1} & \multicolumn{8}{|c|}{next: 17} \\ \hline \end{tabular} \caption{A message} \label{fig:ipv4} \end{figure}