\documentclass[10pt]{article}
\usepackage[paperheight=24mm,paperwidth=24mm,margin=0mm]{geometry}
\usepackage{tikz}
\usetikzlibrary{positioning,calc}
\usepackage{pst-barcode}
\usepackage{marvosym}
\usepackage{graphicx}
\usepackage[T1]{fontenc}
\usepackage{helvet}
\usepackage{rotating}
\renewcommand*{\familydefault}{\sfdefault}

\begin{document}
\thispagestyle{empty}

\begin{turn}{90}

\begin{tikzpicture}[remember picture, overlay, font=\fontsize{6pt}{6pt}\selectfont]

\node at (current page.north) [below, yshift=2mm, xshift=-14mm] (mac1) {00:15:8C:00:C8:73};
\node at (mac1.south) [below, yshift=1mm, xshift=0mm] (sno1) {\begin{pspicture}(0.8in,0.2in)\psbarcode{51315}{width=0.8 height=0.2}{code128}\end{pspicture}};

\node at (sno1.north) [below, yshift=-11mm] (mac2) {00:15:8C:00:C8:73};
\node at (mac2.south) [below, yshift=1mm, xshift=0mm] (sno2) {\begin{pspicture}(0.8in,0.2in)\psbarcode{51315}{width=0.8 height=0.2}{code128}\end{pspicture}};

\end{tikzpicture}

\end{turn}

\end{document}