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Site Information

nigp.org

Link authority for nigp.org (registrable domain: nigp.org) from the Common Crawl web graph: PageRank and harmonic centrality history since 2017, current scores, and the site's top backlink sources.

25Domain PageRank
18Host Backlinks
458Domain Backlinks
Link authority data (PageRank, harmonic centrality) and backlinks come from the Common Crawl web graph.
nigp_org.profile
Current Scores

Web-graph authority (0-100)

Domain scores measure nigp.org as a whole: every subdomain's links rolled up into one node of Common Crawl's domain-level web graph. Host scores measure the exact hostname nigp.org. WWW scores cover the www variant of that hostname, which the graph tracks as its own entry since January 2026 (before that, www and bare host were merged). A big gap between domain and host usually means the domain's authority lives on other subdomains. PageRank is link-endorsement authority: how much weight the sites linking here carry themselves. Harmonic centrality measures reach: how close this site sits to the rest of the web when following links, which favors broadly connected sites over ones boosted by a few heavy linkers. All are normalized 0 to 100 within each crawl snapshot; a dash means that series does not exist for this site.

25
Domain PageRank
2
Host PageRank
-
WWW PageRank
95
Domain Harmonic Centrality
92
Host Harmonic Centrality
-
WWW Harmonic Centrality
Site Intelligence

Homepage

What nigp.org presents on its own homepage: the page title, description, and the social share markup it publishes. Pulled from https://www.nigp.org.

TitleNIGP: Public Procurement Education, Certification and Research
DescriptionNIGP is the leading institute for public procurement. Explore certification, training, research, and consulting for state and local agencies.
OG TitleNIGP: Public Procurement Education, Certification and Research
OG DescriptionNIGP is the leading institute for public procurement. Explore certification, training, research, and consulting for state and local agencies.
Twitter TitleNIGP: Public Procurement Education, Certification and Research
Twitter Cardhttps://s3.us-east-1.amazonaws.com/nigp-prod-media/assets/branding/nigp-logo-masthead.png
Site Intelligence

Social accounts and contact points

Where this site maintains a presence and every reachable route its homepage exposes: social accounts, contact pages, addresses, and content feeds.

Site Intelligence

Structured data (JSON-LD)

The schema.org markup this homepage publishes: the machine-readable identity search engines and AI systems read. Types found: Organization, WebSite, FAQPage.

JSON-LD block (841 bytes)
{"@context":"https:\/\/schema.org","@type":"Organization","name":"NIGP: The Institute for Public Procurement","url":"https:\/\/www.nigp.org","logo":"https:\/\/www.nigp.org\/logo.png","description":"NIGP is the leading professional association for public procurement professionals, providing education, certification, research, and consulting to over 19,000 members across North America.","foundingDate":"1944","numberOfEmployees":"19000","address":{"@type":"PostalAddress","streetAddress":"12007 Sunrise Valley Drive, Suite 110","addressLocality":"Reston","addressRegion":"VA","postalCode":"20191","addressCountry":"US"},"contactPoint":{"@type":"ContactPoint","telephone":"703-736-8900","contactType":"customer service"},"sameAs":["https:\/\/www.linkedin.com\/company\/nigp","https:\/\/www.facebook.com\/nigp","https:\/\/twitter.com\/nigp"]}
JSON-LD block (241 bytes)
{"@context":"https:\/\/schema.org","@type":"WebSite","url":"https:\/\/www.nigp.org","potentialAction":{"@type":"SearchAction","target":"https:\/\/www.nigp.org\/search?q={search_term_string}","query-input":"required name=search_term_string"}}
JSON-LD block (2,442 bytes)
{"@context":"https:\/\/schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What is NIGP?","acceptedAnswer":{"@type":"Answer","text":"NIGP: The Institute for Public Procurement is the leading professional association for public procurement professionals in North America. Founded in 1944, NIGP provides education, certification, research, consulting, and community to over 19,000 members across more than 2,400 state and local agencies."}},{"@type":"Question","name":"What is public procurement?","acceptedAnswer":{"@type":"Answer","text":"Public procurement is the process by which government agencies and public sector organizations purchase goods, services, and works using taxpayer funds. Public procurement professionals are responsible for ensuring these purchases deliver value, comply with regulations, and serve the communities they support."}},{"@type":"Question","name":"What certifications does NIGP offer?","acceptedAnswer":{"@type":"Answer","text":"NIGP offers the NIGP Certified Procurement Professional (NIGP-CPP) certification, which is the only certification promoted, managed, and administered by NIGP. It is ANAB accredited and recognized as the benchmark for competency in public procurement."}},{"@type":"Question","name":"Who can join NIGP?","acceptedAnswer":{"@type":"Answer","text":"NIGP membership is open to public procurement professionals working in state and local government, school districts, hospital systems, counties, townships, and other public agencies, as well as individuals and organizations that support the public procurement profession."}},{"@type":"Question","name":"What is the NIGP Forum?","acceptedAnswer":{"@type":"Answer","text":"The NIGP Forum is the premier annual conference for public procurement professionals, bringing together thousands of practitioners, industry leaders, and suppliers for education, networking, and professional development. The 2026 Forum takes place August 23 to 26 in Columbus, Ohio."}},{"@type":"Question","name":"What is cooperative purchasing?","acceptedAnswer":{"@type":"Answer","text":"Cooperative purchasing is a procurement strategy that allows government agencies to purchase goods and services through contracts established by other public agencies or cooperative organizations, saving time and taxpayer dollars. NIGP provides resources, research, and education to help agencies implement effective cooperative purchasing programs."}}]}
Web-Graph History

Authority over time

Every Common Crawl web-graph release since 2017, roughly quarterly. The domain series goes back to 2017; Common Crawl only began publishing the host-level graph in 2020, so host lines start there. Click a legend entry to show or hide that line. Flat lines are normal for established sites; watch for sustained rises or drops, which track real gains or losses in who links here.

A note on www: through the end of 2025 the source web graph merged www and non-www hostnames into the bare name, so one host line covers both. Starting in January 2026 the graph splits them into separate entries, which is why www can carry its own scores going forward.

Backlink Data

Backlink counts

Unique linking domains seen in Common Crawl's link graphs. This is a different dataset than the 0-100 authority scores above: these are raw counts, host-level for nigp.org and domain-level for nigp.org with all its subdomains combined. Common Crawl covers a large sample of the web, not all of it, so treat counts as comparable between sites rather than absolute totals.

18
Host Backlinks
458
Domain Backlinks
Backlink Data

Top backlinks in the domain graph

Common Crawl publishes two link graphs. The DOMAIN graph connects whole domains: every link from any page of one domain to any page of another. This table shows the highest-authority domains linking to nigp.org (including its subdomains), ranked by the linker's PageRank. The table shows the top 458; the download carries the full stored list (up to 10,000 linkers) as JSON. Click a linker for its own site profile.

Download domain backlinks (.json)

Linking SiteLinker PageRankLinker Harmonic Centrality
wikipedia.org9053
amazon.com8849
blogspot.com8648
outlook.com8344
zendesk.com8342
substack.com8145
harvard.edu8045
azurewebsites.net7939
forrester.com7641
wpenginepowered.com7636
entrepreneur.com7540
texas.gov7439
thomsonreuters.com7438
purdue.edu7342
maryland.gov7339
ufl.edu7339
unc.edu7239
mass.gov7238
prweb.com7238
virginia.gov7237
georgetown.edu7137
nj.gov7137
ky.gov7037
illinois.gov7037
delaware.gov7037
alaska.gov6937
iowa.gov6937
cisecurity.org6937
sans.org6936
state.fl.us6936
sc.gov6837
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alberta.ca6837
nc.gov6836
iastate.edu6836
arkansas.gov6836
pearsonvue.com6835
louisiana.gov6737
ms.gov6736
memberclicks.net6636
umanitoba.ca6537
uh.edu6536
fiu.edu6536
state.nm.us6536
secure-platform.com6535
radancy.com6535
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governing.com6436
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odu.edu6236
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calpoly.edu6235
procore.com6235
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naylor.com6123
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nlc.org6035
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owler.com5835
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iacet.org5424
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whitby.ca5233
spur.org5225
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roundrocktexas.gov5134
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csn.edu5034
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palmbeachstate.edu5033
payrix.com5033
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napex.us5021
psdschools.org4934
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monmouth.nj.us4223
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johnsoncountytn.gov2123
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orcaintelligence.com2119
cppc-ccmp.ca2118
mppoa.net2118
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txppa.org2118
wapp.org2117
elementfleet.ca2020
nmppa.org2018
smartinsearch.com2018
rfpsolutions.ca2017
scipubplus.com1921
mollieplotkingroup.com1920
iucpg.com1918
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bespokecommunity.org1520
clearskiescapital.com1519
speclens.ai1519
kppanigp.org1518
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aznigp.org1517
publicprocurementlearninglab.ca1517
b2b-insiders.com1513
kwsnet.com1422
lanigp.org1418
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magppa.org1318
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ippanigp.org1218
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naefo.org1213
useshukran.com1120
cgccnigp.org1118
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setapp.info1113
envisionedmagazine.com1113
1steppconsulting.com1018
iappo.org1017
cfcnigp.org1017
tmsworld.com1017
ganigp.org1017
apcadec.org.pt1013
occupations.ca1012
albany.or.us923
ppac.us917
oppaweb.org917
pappainc.org917
kappp.org917
adeogunassociates.com917
nigpsefl.org913
apprenticeships.org913
paperadvantage.org823
wanigp.org818
gopmra.org818
oppaoregon.com817
amerifusiongovcon.com812
copperchapter.org812
coopp.org718
mrsupplychain.com718
sledai.com717
etpanews.org717
document.com717
brunswickpha.org717
culturaindependenta.md713
sappa.org617
prichardhousing.com617
speaknow.ai617
refugeecanada.org617
okapp.org617
procuresearch.center613
b2bwz.com611
factmags.com522
talentspline.com517
keleaders.com517
gcagpo.org516
p-links-bhs.xyz514
u-links-bhs.xyz514
y-links-bhs.xyz514
bgtconsult.ai513
dfwnigp.org512
huodaiwang.com512
o-links-bhs.xyz417
nigp-tampabay.org413
r-links-bhs.xyz413
q-links-bhs.xyz413
t-links-bhs.xyz413
i-links-bhs.xyz413
w-links-bhs.xyz413
e-links-bhs.xyz413
indiaprocurement.in413
nigpabchapter.ca412
mansfieldhousing.org412
austinontapp.org412
k12conferences.com317
polyapply.org317
oryoniq.com312
mappofnigp.org013
cgcnigp.org010
selanigp.com00
dcnigp.org00
elpasochapternigp.org00
tad4auditor.com00
mokancpp.org00
nfpanigp.org00
nigpny.org00
altool.net00
wvnigp.org00
norcalnigp.org00
Backlink Data

Top backlinks in the host graph

The HOST graph connects exact hostnames, so subdomains count separately. This table shows the highest-authority hosts linking to nigp.org specifically, ranked by the linker's PageRank. The table shows the top 18; the download carries the full stored list (up to 10,000 linkers) as JSON. Click a linker for its own site profile.

Download host backlinks (.json)