We present the analysis of archival data from ROSAT and ASCA of a serendipitous source PKS 2316-423 .
According to its featureless non-thermal radio/optical continuum , the object has been assumed as a BL Lac candidate in the literature .
PKS 2316-423 was evident variable over the multiple X-ray observations .
Specially , a variable high-energy tail of the synchrotron radiation is revealed .
X-ray spectral analysis provided further evidence of its synchrotron-nature broad-band spectrum with steep and down-curved shape in the range of 0.1–10 keV , this is general signature of a HBL .
The spectral energy distribution ( SED ) through radio-to-X-ray yields the synchrotron radiation peak at frequency \nu _ { p } = 7.3 \times 10 ^ { 15 } Hz , with integrated luminosity of L _ { syn } = 2.1 \times 10 ^ { 44 } ergs s ^ { -1 } , this suggest that PKS 2316-423 is a low luminosity BL Lac object with high synchrotron peak frequency .
Further SED analysis suggest that PKS 2316-423 is a very low luminosity “ intermediate ” or high energy peaked BL Lac object .
Given the unusual low luminosity , the further studies of PKS 2316-423 might give clues on the evolution properties of BL Lacs .

KEYWORDS : BL Lac objects : individual ( PKS 2316-423 ) – X-rays : galaxies