ASN AS18402 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS18402?

AS18402 is listed under National Library Board.

What do peers, upstreams, and downstreams mean in ASN data?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

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AS18402 National Library Board

National Library Board nlb.gov.sg

SG 7 Routes

AS Data

AS18402

AS18402 – National Library Board

AS Number	18402
AS Name	NLB-AS-SG-AP
Organization	National Library Board (org-nlb1-ap)
Country	SG
Website	nlb.gov.sg
Number of IPv4 Routes	6
Number of IPv6 Routes	1
ASN type	GOVERNMENT
Registry	APNIC
Date Allocated	N/A

ASN Intelligence API for production workflows

Use ASN data for AS18402 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
203.78.15.0/24	AS18402	National Library Board	National Library Board	256
203.78.13.0/24	AS18402	National Library Board	National Library Board	256
203.78.14.0/24	AS18402	National Library Board	National Library Board	256
203.78.9.0/24	AS16509	Amazon.com, Inc.	National Library Board	256
203.78.11.0/24	AS18402	National Library Board	National Library Board	256
203.78.12.0/24	AS18402	National Library Board	National Library Board	256
2001:df0:301::/48	AS18402	National Library Board	GOVERNMENT TECHNOLOGY AGENCY	~1×10²⁴

Raw Whois Response

% [whois.apnic.net]
% Whois data copyright terms    http://www.apnic.net/db/dbcopyright.html

% Information related to 'AS17653 - AS18431'

as-block:       AS17653 - AS18431
descr:          APNIC ASN block
remarks:        These AS numbers are further assigned by APNIC
remarks:        to APNIC members and end-users in the APNIC region
admin-c:        HM20-AP
tech-c:         HM20-AP
mnt-by:         APNIC-HM
mnt-lower:      APNIC-HM
last-modified:  2019-01-08T23:19:07Z
source:         APNIC

role:           APNIC Hostmaster
address:        P.O. BOX 2131
address:        4101 QLD
country:        AU
phone:          +61 7 3858 3100
fax-no:         +61 7 3858 3199
e-mail:         helpdesk@apnic.net
admin-c:        AMS11-AP
tech-c:         AH256-AP
nic-hdl:        HM20-AP
remarks:        Administrator for APNIC
notify:         hostmaster@apnic.net
mnt-by:         MAINT-APNIC-AP
last-modified:  2026-08-14T00:28:10Z
source:         APNIC

% Information related to 'AS18402'

% Abuse contact for 'AS18402' is 'nis_help@nlb.gov.sg'

aut-num:        AS18402
as-name:        NLB-AS-SG-AP
descr:          NATIONAL LIBRARY BOARD
descr:          NETWORK OPERATION CENTRE
descr:          SINGAPORE
country:        SG
import:         from AS7658 accept any
import:         from AS9226 accept any
import:         from AS4628 accept any
import:         from AS4657 accept any
import:         from AS3758 accept any
export:         to AS7658 announce AS18402
export:         to AS9226 announce AS18402
export:         to AS4628 announce AS18402
export:         to AS4657 announce AS18402
export:         to AS3758 announce AS18402
org:            ORG-NLB1-AP
admin-c:        TS2000-AP
tech-c:         TS2000-AP
abuse-c:        AN1055-AP
notify:         POH_CHOY_YEE@NLB.GOV.SG
remarks:        -----BEGIN CERTIFICATE-----MIID0zCCArugAwIBAgIUECUa6TiG72R9SwsMoO0ckcMaH8wwDQYJKoZIhvcNAQELBQAweTELMAkGA1UEBhMCU0cxEjAQBgNVBAgMCVNJTkdBUE9SRTESMBAGA1UEBwwJU0lOR0FQT1JFMR8wHQYDVQQKDBZOQVRJT05BTCBMSUJSQVJZIEJPQVJEMSEwHwYDVQQLDBhURUNITk9MT0dZIFNFUlZJQ0UgR1JPVVAwHhcNMjYwNzE3MDMyNjMyWhcNMjcwNzE3MDMyNjMyWjB5MQswCQYDVQQGEwJTRzESMBAGA1UECAwJU0lOR0FQT1JFMRIwEAYDVQQHDAlTSU5HQVBPUkUxHzAdBgNVBAoMFk5BVElPTkFMIExJQlJBUlkgQk9BUkQxITAfBgNVBAsMGFRFQ0hOT0xPR1kgU0VSVklDRSBHUk9VUDCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBALizMEDWcxY/kpAJXPP07/QuTWs5AzgaU+j5pFymqThPd/OCer5w0dE8njNGij9FI+XSZWOqKKB5smyPOZyKoxRhkHJTEWzW//wBGeOlCOd71J9BvFJ5xLkq4gJOOg9RZGgLdVIO2KwvOTUrMEpw9vi7SqY+/bf/hOdQtAnenQKj2Bh68zZV73p8ljxKktO4CNkz40fuR1Be9pIgOrStFIClq3/Oo+HoJOo45Q7NMnARGhIqa4OtMdU/xYDmUW1+Mp/kPQ9X5BHxFAZ8yQ9tCP6TBjBvB3Yk4/SvqAtyUhmua4m/6TT+riU4c+6OxEM7+RM/vsRHSgMQp3q7YjKhJ9UCAwEAAaNTMFEwHQYDVR0OBBYEFNeMsGzImPQWcrjySQiNJ1ARvcN5MB8GA1UdIwQYMBaAFNeMsGzImPQWcrjySQiNJ1ARvcN5MA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZIhvcNAQELBQADggEBAI0iodBj3ksKG4Nro+hfTWEjj1RWisOLTLYc+yByJEmh/61WnASclyaABg6Z0vhHuCx5rUj2ZxFz1KmaYOZp1GUZS/S3ToXwLQ31nxzUwt5dn2C95uvPb454QqQISVqneLKiRCrR6nj41oEx/3wA4uerSHJ4Yq+SzLJzdOh3DJH9FIOokaasuBtcjmYJJp3Qt0/FG4ZHLROxzlQ7Zx9e6nwY8hUWz/EETngcoEg/IsotVTpEtzjrnQvfANdNLiq2kjuBVRZtcNbpJfTuqDMuNws4DJYRS7+M5qvhN/v0dB0/EVIVZPxwlWPj5uqxgzK2pDXZa6MyJORxp2IjdYkIfao=-----END CERTIFICATE-----
mnt-lower:      MAINT-SG-NLB
mnt-routes:     MAINT-SG-NLB
mnt-by:         APNIC-HM
mnt-irt:        IRT-NLB-NON-SG
last-modified:  2026-08-13T02:25:06Z
source:         APNIC

irt:            IRT-NLB-NON-SG
address:        BLK 750D CHAI CHEE ROAD
address:
address:        SINGAPORE 469004
e-mail:         nis_help@nlb.gov.sg
abuse-mailbox:  nis_help@nlb.gov.sg
admin-c:        TS2000-AP
tech-c:         TS2000-AP
auth:           # Filtered
remarks:        nis_help@nlb.gov.sg was validated on 2026-05-20
mnt-by:         MAINT-SG-NLB
last-modified:  2026-07-17T09:07:45Z
source:         APNIC

organisation:   ORG-NLB1-AP
org-name:       National Library Board
org-type:       LIR
country:        SG
address:        Blk750D Chai Chee Road
address:        Technopark @ ChaiChee # 03-01/02
phone:          +65-6704-1057
fax-no:         +65-6446-7608
e-mail:         enquiry@nlb.gov.sg
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2023-09-05T02:14:54Z
source:         APNIC

role:           ABUSE NLBNONSG
country:        ZZ
address:        BLK 750D CHAI CHEE ROAD
address:
address:        SINGAPORE 469004
phone:          +000000000
e-mail:         nis_help@nlb.gov.sg
admin-c:        TS2000-AP
tech-c:         TS2000-AP
nic-hdl:        AN1055-AP
remarks:        Generated from irt object IRT-NLB-NON-SG
remarks:        nis_help@nlb.gov.sg was validated on 2026-05-20
abuse-mailbox:  nis_help@nlb.gov.sg
mnt-by:         APNIC-ABUSE
last-modified:  2026-05-20T02:20:37Z
source:         APNIC

person:         TAUFIK SUPAN
nic-hdl:        TS2000-AP
e-mail:         TAUFIK_SUPAN@NLB.GOV.SG
address:        Blk750D Chai Chee Road
address:        #03-01 Singapore 469004
country:        SG
phone:          +65-6704-1057
fax-no:         +65-6446-7608
mnt-by:         MAINT-SG-NLB
last-modified:  2017-02-26T23:41:04Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.48 (WHOIS-UK2)

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.apnic.net",
  "as_blocks" : [ {
    "as_block" : "AS17653 - AS18431",
    "description" : [ "APNIC ASN block" ],
    "admin_contacts" : [ "HM20-AP" ],
    "tech_contacts" : [ "HM20-AP" ],
    "remarks" : [ "These AS numbers are further assigned by APNIC", "to APNIC members and end-users in the APNIC region" ],
    "mnt_by" : [ "APNIC-HM" ],
    "mnt_lower" : [ "APNIC-HM" ],
    "date_updated" : "2019-01-08",
    "source" : "APNIC"
  } ],
  "aut_nums" : [ {
    "aut_num" : "AS18402",
    "as_name" : "NLB-AS-SG-AP",
    "description" : [ "NATIONAL LIBRARY BOARD", "NETWORK OPERATION CENTRE", "SINGAPORE" ],
    "country" : "SG",
    "import" : [ "from AS7658 accept any", "from AS9226 accept any", "from AS4628 accept any", "from AS4657 accept any", "from AS3758 accept any" ],
    "export" : [ "to AS7658 announce AS18402", "to AS9226 announce AS18402", "to AS4628 announce AS18402", "to AS4657 announce AS18402", "to AS3758 announce AS18402" ],
    "organization" : "ORG-NLB1-AP",
    "admin_contacts" : [ "TS2000-AP" ],
    "tech_contacts" : [ "TS2000-AP" ],
    "abuse_contacts" : [ "AN1055-AP" ],
    "remarks" : [ "-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----" ],
    "notify" : [ "POH_CHOY_YEE@NLB.GOV.SG" ],
    "mnt_irt" : [ "IRT-NLB-NON-SG" ],
    "mnt_lower" : [ "MAINT-SG-NLB" ],
    "mnt_routes" : [ "MAINT-SG-NLB" ],
    "mnt_by" : [ "APNIC-HM" ],
    "date_updated" : "2026-08-13",
    "source" : "APNIC"
  } ],
  "irt" : {
    "handle" : "IRT-NLB-NON-SG",
    "address" : [ "BLK 750D CHAI CHEE ROAD", "SINGAPORE 469004" ],
    "street" : "Blk 750d Chai Chee Road",
    "city" : "Singapore",
    "zip_code" : "469004",
    "email" : [ "nis_help@nlb.gov.sg" ],
    "abuse_mailbox" : [ "nis_help@nlb.gov.sg" ],
    "admin_contacts" : [ "TS2000-AP" ],
    "tech_contacts" : [ "TS2000-AP" ],
    "remarks" : [ "nis_help@nlb.gov.sg was validated on 2026-05-20" ],
    "mnt_by" : [ "MAINT-SG-NLB" ],
    "date_updated" : "2026-07-17",
    "source" : "APNIC"
  },
  "organization" : {
    "handle" : "ORG-NLB1-AP",
    "name" : "National Library Board",
    "type" : "LIR",
    "address" : [ "Blk750D Chai Chee Road", "Technopark @ ChaiChee # 03-01/02" ],
    "street" : "Chai Chee Road Technopark @ Chaichee",
    "country" : [ "SG" ],
    "email" : [ "enquiry@nlb.gov.sg" ],
    "phone" : [ "+65-6704-1057" ],
    "fax_no" : [ "+65-6446-7608" ],
    "mnt_ref" : [ "APNIC-HM" ],
    "mnt_by" : [ "APNIC-HM" ],
    "date_updated" : "2023-09-05",
    "source" : "APNIC"
  },
  "administrative_contacts" : [ {
    "handle" : "TS2000-AP",
    "name" : "TAUFIK SUPAN",
    "address" : [ "Blk750D Chai Chee Road", "#03-01 Singapore 469004" ],
    "street" : "Chai Chee Road #03-01",
    "city" : "Singapore",
    "zip_code" : "469004",
    "country" : "SG",
    "email" : [ "TAUFIK_SUPAN@NLB.GOV.SG" ],
    "phone" : [ "+65-6704-1057" ],
    "fax_no" : [ "+65-6446-7608" ],
    "mnt_by" : [ "MAINT-SG-NLB" ],
    "date_updated" : "2017-02-26",
    "source" : "APNIC"
  } ],
  "technical_contacts" : [ {
    "handle" : "TS2000-AP",
    "name" : "TAUFIK SUPAN",
    "address" : [ "Blk750D Chai Chee Road", "#03-01 Singapore 469004" ],
    "street" : "Chai Chee Road #03-01",
    "city" : "Singapore",
    "zip_code" : "469004",
    "country" : "SG",
    "email" : [ "TAUFIK_SUPAN@NLB.GOV.SG" ],
    "phone" : [ "+65-6704-1057" ],
    "fax_no" : [ "+65-6446-7608" ],
    "mnt_by" : [ "MAINT-SG-NLB" ],
    "date_updated" : "2017-02-26",
    "source" : "APNIC"
  } ],
  "abuse_contacts" : [ {
    "handle" : "AN1055-AP",
    "name" : "ABUSE NLBNONSG",
    "address" : [ "BLK 750D CHAI CHEE ROAD", "SINGAPORE 469004" ],
    "street" : "Blk 750d Chai Chee Road",
    "city" : "Singapore",
    "zip_code" : "469004",
    "country" : "ZZ",
    "email" : [ "nis_help@nlb.gov.sg" ],
    "abuse_mailbox" : [ "nis_help@nlb.gov.sg" ],
    "phone" : [ "+000000000" ],
    "admin_contacts" : [ "TS2000-AP" ],
    "tech_contacts" : [ "TS2000-AP" ],
    "remarks" : [ "Generated from irt object IRT-NLB-NON-SG", "nis_help@nlb.gov.sg was validated on 2026-05-20" ],
    "mnt_by" : [ "APNIC-ABUSE" ],
    "date_updated" : "2026-05-20",
    "source" : "APNIC"
  } ]
}

Peers

AS Number	Description	Country
AS3758	SingNet Pte Ltd	SG
AS9255	Singapore Telecom	SG
AS4628	PACIFIC INTERNET S PTE. LTD.	SG
AS16509	Amazon.com, Inc.	US
AS4657	Starhub Ltd.	SG
AS9226	1 Net Singapore Pte Ltd	SG
AS9255	Singapore Telecom, ConnectPlus	SG
AS7658	1 Net Singapore Pte Ltd	SG