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  2. Aadhaar - Wikipedia

    en.wikipedia.org/wiki/Aadhaar

    Aadhaar ( Hindi: आधार, lit. 'base, foundation') [ 7] is a twelve-digit unique identity number that can be obtained voluntarily by all residents of India, based on their biometrics and demographic data. [ 8] The data is collected by the Unique Identification Authority of India (UIDAI), a statutory authority established in January 2016 by ...

  3. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    1xx—Provisional Responses. 100 Trying. Extended search being performed may take a significant time so a forking proxy must send a 100 Trying response. [ 1]: §21.1.1. 180 Ringing. Destination user agent received INVITE, and is alerting user of call. [ 1]: §21.1.2. 181 Call is Being Forwarded.

  4. Error analysis for the Global Positioning System - Wikipedia

    en.wikipedia.org/wiki/Error_analysis_for_the...

    Few civilian receivers have ever used the P-code, and the accuracy attainable with the public C/A code was much better than originally expected (especially with DGPS), so much so that the antispoof policy has relatively little effect on most civilian users. Turning off antispoof would primarily benefit surveyors and some scientists who need ...

  5. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided. 497 HTTP Request Sent to HTTPS Port. An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests. 499 Client Closed Request.

  6. Why did I receive an email from MAILER-DAEMON? - AOL Help

    help.aol.com/articles/what-is-a-mailer-daemon...

    The most common reason for a failed delivery is that the email address entered isn't valid. If the delivery failure message says the account doesn't exist double check the spelling of the address you entered. A single misplaced letter could cause a delivery failure. If the message keeps getting bounced back, make sure the account is closed or ...

  7. National identification number - Wikipedia

    en.wikipedia.org/wiki/National_identification_number

    The identification number has 8-digit standard format: NNNNNNN (N), where N is a numeric digit 0–9. The first numeric digit N has special meaning, and it can be one of the following digits: '1', '5' or '7'. '1': The first-time date of issuance of ID card to the bearer was 1992 or later.

  8. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    X.3.XXX Mail System Status. X.4.XXX Network and Routing Status. X.5.XXX Mail Delivery Protocol Status. X.6.XXX Message Content or Media Status. X.7.XXX Security or Policy Status. The meaning of the "detail" field depends on the class and the subject, and are listed in RFC 3463 and RFC 5248 . A server capable of replying with an Enhanced Status ...

  9. Error correction code - Wikipedia

    en.wikipedia.org/wiki/Error_correction_code

    Low-density parity-check (LDPC) codes are a class of highly efficient linear block codes made from many single parity check (SPC) codes. They can provide performance very close to the channel capacity (the theoretical maximum) using an iterated soft-decision decoding approach, at linear time complexity in terms of their block length.