-- binary
00 03 # class
27 # type/masked
80 # length
00 00 00 00 00 00 00 00 # value
00 00 00 00 00 00 00 00 # ...
00 00 00 00 00 00 00 00 # ...
00 00 00 00 00 00 00 00 # ...
00 00 00 00 00 00 00 00 # ...
00 00 00 00 00 00 00 00 # ...
00 00 00 00 00 00 00 00 # ...
00 00 00 00 00 00 00 00 # ...
7f ff ff ff ff ff ff ff # mask - Only ports 0, 17, 96, 511 are selected (and thus are zero)
ff ff ff ff ff ff ff ff # ...
ff ff ff ff ff ff ff ff # ...
ff ff ff ff ff ff ff ff # ...
ff ff ff ff ff ff ff ff # ...
ff ff ff ff ff ff ff ff # ...
ff ff ff fe ff ff ff ff # ...
ff ff ff ff ff fd ff fe # ...
-- python
ofp.oxm.bsn_in_ports_512_masked(set(), set(range(0,512)) - set((0, 17, 96, 511)))
-- c
obj = of_oxm_bsn_in_ports_512_masked_new(OF_VERSION_1_3);
{
    of_bitmap_512_t bmap = { { 0, 0, 0, 0, 0, 0, 0, 0 } };
    of_oxm_bsn_in_ports_512_masked_value_set(obj, bmap);
}
{
    of_bitmap_512_t bmap = { { 0x7fffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xfffffffeffffffff, 0xfffffffffffdfffe } };
    of_oxm_bsn_in_ports_512_masked_value_mask_set(obj, bmap);
}
-- java
OFPortMap portmap = OFPortMap.ofPorts(OFPort.of(0), OFPort.of(17), OFPort.of(96));
builder.setValue(portmap.getValue());
builder.setMask(portmap.getMask());