HelenOS sources

OPB_RA            511 uspace/srv/net/dnsrsrv/dns_msg.c 	    (msg->ra ? BIT_V(uint16_t, OPB_RA) : 0) |
OPB_RA            609 uspace/srv/net/dnsrsrv/dns_msg.c 	msg->ra = BIT_RANGE_EXTRACT(uint16_t, OPB_RA, OPB_RA, hdr->opbits);
HelenOS homepage, sources at GitHub