Hex Port Numbers
SQL
libc system calls
RFC
Linux Command Flags
100
TCP port 0x50
What is HTTP (80)
100
The SQL to return all rows in a table
SELECT * FROM mytable
100
This call sorts an array with $nmemb elements of size $size
What is qsort(3)
100
RFC2821
What is the current RFC for SMTP?
100
The command to remount a subtree somewhere else.
What is mount --bind?
200
TCP port 0x17
What is telnet (23)
200
The SQL to delete all rows in a table
What is TRUNCATE or DELETE FROM mytable
200
This call creates a new mapping in the virtual address space of the calling process
What is mmap(2)
200
RFC1918
What is the RFC for Address Allocation for Private Networks
200
SSH option to forward connections made to the remote server to the local side
What is ssh -R
300
TCP/UDP port 0x7B
What is NTP (123)
300
A construct where rows may be missing in the right-side table of a join
What is a LEFT OUTER JOIN
300
This call creates an endpoint for communication and returns a file descriptor that refers to that endpoint.
What is socket(2)
300
RFC1149
What is the RFC for transmission of IP datagrams over Avian Carriers?
300
openssl option to establish an encrypted connection to a remote server, a "secure netcat"
What is openssl s_client
400
TCP/UDP port 0x25
What is time (37)
400
SQL isolation level to make it seem like you are the only one working on the database
What is SERIALIZABLE isolation level
400
This call extracts the first connection request on the queue of pending connections for the listening socket.
What is accept(2)
400
RFC2616
What is the RFC for HTTP/1.1?
400
gpg command to generate a revocation certificate for the complete key
What is gpg --gen-revoke
500
TCP port 0x1BB
What is https (443)
500
The for-loop of SQL. Runs a query on the right table for every row on the left.
What is a LATERAL JOIN
500
This call copies the string pointed to by src, including the terminating null byte ('\0'), to the buffer pointed to by dest.
What is strcpy(3)
500
RFC6698
What is the RFC for DNS-based Authentication of Named Entities.
500
The flag to make tcpdump exit after a certain number of packets has been received
What is tcpdump -c
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