Top organizations by netblock count

The largest organisations in our index, ranked by number of registered netblocks. Last computed 2026-09-06.

This ranks individual registry-name clusters. Where one organisation holds space under several different names, browse organisation entities to see them grouped.

# Organisation Attribution Netblocks
401 Silicon Sky Consulting 902
402 FASTWEB-AMPLIFON_ITALIA 901
403 AS21826 900
404 MOBIFONE Corporation 891
405 Mobile Communication Company of Iran PLC 890
406 Facebook, Inc. 885
407 velia.net Internetdienste GmbH 883
408 Tikona Infinet Ltd. 883
409 TIWS-SMART-NETECONOMY 881
410 B2 Net Solutions Inc. 878
411 Unitymedia-B2B-NET 878
412 PAVLOV MEDIA INC GLEIF verified 872
413 BT-CUST-RESERVED-NET 868
414 ATT-EIPAM 867
415 Ote SA (Hellenic Telecommunications Organisation) GLEIF verified 865
416 TESNETWORK 865
417 STICHTING_DUWO 864
418 L99680 861
419 FR-POMPAC-DEVELOPPEMENT--LB_INTERNET 859
420 AS28118 858
421 Telenor A/S ORG-SA20-RIPE 858
422 PE-CE_WAN 856
423 China Networks Inter-Exchange 854
424 Pacific Internet Pte Ltd 854
425 Iron Mountain Data Center 848
426 AS272096 847
427 BUNNYWAY, informacijske storitve d.o.o. 843
428 TBC Corporation GLEIF verified 836
429 Golden Telecom LLC 831
430 Swisscom (Schweiz) AG GLEIF verified 830
431 Africa on Cloud 830
432 BT-CORPORATE 828
433 AS28006 826
434 JRB 826
435 Realmove Company Limited 826
436 Florida Department of Management Services - Division of Telecommunications 819
437 Baxet Group Inc. 817
438 RITUALS-GTT 817
439 LITE CLOUD INC GLEIF verified 813
440 Elisa Corporation GLEIF verified 810
441 Atria Convergence Technologies Pvt. Ltd., GLEIF verified 808
442 intercolo GmbH 808
443 Netia SA ORG-NTS2-RIPE 807
444 1&1 Versatel GmbH GLEIF verified 806
445 UCLOUD INFORMATION TECHNOLOGY (HK) LIMITED 805
446 IDC, China Telecommunications Corporation 804
447 CHINANET Guangdong province Shenzhen MAN network 803
448 AS6503 802
449 Vultr Holdings, LLC 801
450 Alliance Broadband Services Pvt. Ltd. 798
451 AS19429 794
452 NOS COMUNICACOES, S.A. ORG-TPS1-RIPE 793
453 CENIC 790
454 Spark Ventures GLEIF verified 786
455 Mobile Telecom-Service LLP 782
456 XS4ALL-CUST 781
457 ECO-D1102721-NET 780
458 HUAWEI INTERNATIONAL PTE. LTD. GLEIF verified 778
459 Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH ORG-NLTu1-RIPE 778
460 JIANGSUGROUP 776
461 SingTel Optus Pty Ltd 772
462 SkyWire (PTY) LTD GLEIF verified 770
463 PT Aplikanusa Lintasarta 770
464 Pioneer Elabs Ltd. GLEIF verified 768
465 HOS-468873 767
466 PT XL Axiata Tbk GLEIF verified 766
467 MitaX Network 766
468 Airtel Networks Limited GLEIF verified 766
469 COOP Sverige AB GLEIF verified 764
470 Hughes Network Systems, LLC GLEIF verified 764
471 xTom GmbH 763
472 BYXC 761
473 AS18809 758
474 Vyve Broadband 757
475 Saudi Telecom Company JSC ORG-SSTC1-RIPE 757
476 Respina Networks & Beyond PJSC 756
477 Telecom Algeria 752
478 BIZONEFIVE 751
479 Radiant Communications Ltd NIXI 749
480 Shared Services Canada 745
481 Lumen Technologies UK Limited ORG-LC4-RIPE 744
482 FR-AXA-ASSURANCES--LB_INTERNET 744
483 JCOM Co., Ltd. GLEIF verified 742
484 ACTION-SERVICE-DISTRIBUTIE-B-V-GTT 741
485 Buckeye Cablevision, Inc. 741
486 Expereo International BV GLEIF verified 740
487 BIZFIVE 740
488 NetActuate, Inc 738
489 BT 737
490 iiNet Limited GLEIF verified 736
491 Bharti Airtel Limited ORG-BAL1-AP 734
492 Xneelo Ltd xneelo-cloud 731
493 AEZA GROUP LLC GLEIF verified 730
494 Colocation America Corporation 728
495 TurkTelekom 725
496 DT-MESCHEDE-NET 724
497 Hulum Almustakbal Company for Communication Engineering and Services Ltd 724
498 LEASEWEB 723
499 DXC US Latin America Corporation 723
500 NATIONAL INFORMATION RESOURCES SERVICE 722
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