NASC Server

Server List > NASC Server

This is the authentication server of the 3DS. A single endpoint (ac) is used for all requests. Other requests are redirected to http://www.nintendo.com.

• General
• Headers
• Actions
• Errors
• Examples

General

Main server: https://nasc.nintendowifi.net/ac

Other servers:

• https://nasc.test.nintendowifi.net/ac
• https://nasc.dev.nintendowifi.net/ac

The common client certificate (ctr-common-1) is required to access these servers. If it is not provided, the server rejects the TLS handshake.

Headers

Header	Description
Host	nasc.nintendowifi.net
X-GameId	The current game id (%08X)
User-Agent	CTR FPD/%04X (see FPD version)
Content-Type	application/x-www-form-urlencoded
Content-Type	application/x-www-form-urlencoded
Content-Length	Content length

Note that the Content-Type header is included twice.

FPD Version

System version	FPD version
11.15.0	15
11.16.0	16

Actions

All form values are encoded with a custom base64 character set, where +/= are replaced by .-* respectively. This applies to both the request and the response.

The type of request is specified by the action parameter. Other parameters depend on the type of action. The action name is case insensitive.

• LOGIN
• SVCLOC
• nzchk
• parse
• message

LOGIN

This action provides the location of the game server and a token.

Param	Description
gameid	Game server id (%08X). This is the same as the X-GameId header.
sdkver	Major and minor SDK version (%03d%03d). Always 000000.
titleid	Title id (%016X)
gamecd	Product code, e.g. AMKP for Mario Kart 7
gamever	Title version (%04X)
mediatype	0=System, 1=Digital, 2=Cartridge
romid	Rom id, only present if the media type is 2
makercd	Product maker code (company code)
unitcd	Always 2
macadr	MAC address of the 3DS
bssid	BSSID of active wifi network
apinfo	Not sure, looks like 01:0000000000
fcdcert	See LocalFriendCodeSeed_B
devname	Device name (UTF-16-LE)
servertype	Environment (L1 for production)
fpdver	FPD version (%04X). This is also included in the user agent.
devtime	Current device time (%y%m%d%H%M%S)
lang	Language code (%02X)
region	Region code (%02X)
csnum	Serial number

Then, either:

Param	Description
uidhmac	PID HMAC, received during account creation
userid	PID, received during account creation

or:

Param	Description
passwd	Password for new account

Finally, the following parameters are always present:

Param	Description
action	LOGIN
ingamesn	Nickname provided by game (usually empty)

On success, the server sends the following response:

Field	Description
locator	Host and port of game server
retry	Always 0
returncd	Always 001 (success)
token	Token for logging in on game server
datetime	Current server time (%Y%m%d%H%M%S)

Errors

On error, the server sends the following response:

Field	Description
retry	0 or 1
returncd	Error code (see below)
datetime	Current server time (%Y%m%d%H%M%S)

Sometimes, returncd is set to null instead of an error code.

Known Errors

Code	Description
001	Success
102	Device is banned
109	Missing or malformed parameter in request
110	Game server is no longer available
119	FPD version is invalid
121	Device certificate is invalid
122	PID HMAC is invalid
125	Game id is invalid

Examples

LOGIN request:

POST /ac HTTP/1.1
Host: nasc.nintendowifi.net
X-GameId: 00030600
User-Agent: CTR FPD/000F
Content-Type: application/x-www-form-urlencoded
Content-Type: application/x-www-form-urlencoded
Content-Length: 876

gameid=MDAwMzA2MDA%2A&sdkver=MDAwMDAw&titleid=MDAwNDAwMDAwMDAzMDcwMA%2A%2A&gamecd=QU1LUA%2A%2A&gamever=MDAwMQ%2A%2A&mediatype=Mg%2A%2A&romid=KJJ3Tnsrdw0qZH0UZQX-VDg%2A&makercd=MDE%2A&unitcd=Mg%2A%2A&macadr=MDQxZDY3ZWQ4YmYw&bssid=NmM4ODUwYzJiYTdh&apinfo=MDE6MDAwMDAwMDAwMA%2A%2A&fcdcert=eGKuWyeaY08jt6Z8T9VzJKRtVk3k212--NVn1UmjsSMKDLzyEC0PvOIM6qVpKNQq3qcVvtlX542KrzTZ5UdxqZiCkaAMEZ0r8y5ygU8F-NBmFo30JFMHWz-JvQWzbNMBXYncbSayAbREdf9CjGOFp1sUGEpu-OCkbOPHyqgCloGo9iIWVIMzNzapjhuNsZSv3bPMkcXyf8KvLwAk-831y4JfPlu4DZKrCR3KNYt.jzZ-MGZFXSiElFSlCinlCnmpJR7UWvYHJOjxAAu0W9ShlbymJOPuTQJB-PzpVouSrQ3lcq7lQexJQ7l1znK1IoVssn0.XDCzDAPtCG9piIam6wAAAAAAAAAAIPX9AQAAAAA%2A&devname=aABlAGwAbABvAHcAbwByAGwAZAA%2A&servertype=TDE%2A&fpdver=MDAwRg%2A%2A&devtime=MTgwNjIzMjEwMTQ1&lang=MDM%2A&region=MDI%2A&csnum=Q0VGMTEwNTQ2OTI%2A&uidhmac=ZThhMmE5MWU%2A&userid=MTAwMDg5NDY0&action=TE9HSU4%2A&ingamesn=

LOGIN response:

HTTP/1.1 200 OK
NODE: pd42wfiap02
Content-Type: text/plain;charset=ISO-8859-1
Content-Length: 248
Date: Tue, 18 Jan 2022 10:50:37 GMT
Server: Nintendo Wii (http)
Connection: keep-alive

locator=MzUuMTYzLjIuODk6NDA0NjA*&retry=MA**&returncd=MDAx&token=CJyBSE-auxaKzdxCnvLJoRicRYB0OnFLoA1wk7Kc34yHTItFZRx.44-DvizdksgEZf-BRyqNeHtUkjqzR3b69XftWqNdg7mZDg-P2rz0jqTTkujbTXwEXsDuqnYx30K2DrcY97F7m52HXBiJCCKnmQ**&datetime=MjAyMjAxMTgxMDUwMzc*

Example error response:

HTTP/1.1 200 OK
NODE: pd42wfiap01
Content-Type: text/plain;charset=ISO-8859-1
Content-Length: 56
Date: Wed, 19 Jan 2022 09:21:41 GMT
Server: Nintendo Wii (http)

retry=MA**&returncd=MDA5&datetime=MjAyMjAxMTkwOTIxNDE*

Redirect to http://www.nintendo.com

HTTP/1.0 302 Moved Temporarily
Location: http://www.nintendo.com
Server: BigIP
Connection: Keep-Alive
Content-Length: 0