I was checking my DNS queries (with logs) and found that there is a lot of query as below with that Ip address but I can not understand why on port 80 and what is the (2)sl(0) as name/host name.
9/9/2021 7:43:24 AM 0CBC PACKET 00000000016E4F90 UDP Rcv 72.9.21.67 4567 Q [0001 D NOERROR] ALL (2)sl(0)
UDP question info at 00000000016E4F90
Socket = 336
Remote addr 72.9.21.67, port 80
Time Query=71848, Queued=0, Expire=0
Buf length = 0x0fa0 (4000)
Msg length = 0x001f (31)
Message:
XID 0x4567
Flags 0x0100
QR 0 (QUESTION)
OPCODE 0 (QUERY)
AA 0
TC 0
RD 1
RA 0
Z 0
CD 0
AD 0
RCODE 0 (NOERROR)
QCOUNT 1
ACOUNT 0
NSCOUNT 0
ARCOUNT 1
QUESTION SECTION:
Offset = 0x000c, RR count = 0
Name "(2)sl(0)"
QTYPE ALL (255)
QCLASS 1
ANSWER SECTION:
empty
AUTHORITY SECTION:
empty
ADDITIONAL SECTION:
Offset = 0x0014, RR count = 0
Name "(0)"
TYPE OPT (41)
CLASS 65535
TTL 0
DLEN 0
DATA
Buffer Size = 65535
Rcode Ext = 0
Rcode Full = 0
Version = 0
Flags = 0