240 (Maryland)

454 Blocks Found in Area 240 - List All

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Block Name Assigned To Switches 240-249 LEVEL 3 US LEC NATIONSLINE COMCAST DIGITAL PHONE PAETEC COMMUNICATIONS IDT AMERICA TELEPORT COMMUNICATIONS GROUP RSTNVA91DS0 TYCRVA03DS0 WASHDC12DS5 MNSSVAKQPS0 CHCHMDBE6MD LNTWMDAXPS0 MCLNVA23DS4 WASHDCTTDS0 240-751 AT&T MOBILITY LEVEL 3 LEVEL 3 BTVLMD18GT0 CHCHMDBE5MD RSTNVA91DS0 240-332 GLOBAL NAPS RSTNVA31DS0 240-428 CRICKET COMMUNICATIONS STNHVAABGT0 240-468 SPRINT PCS BTVLMDCKCM1 240-823 XO COMMUNICATIONS INC DSL.NET WASHDCCZDS0 WASHDCCZDS1 VINNVAGX0MD 240-313 AT&T MOBILITY VERIZON MARYLAND SPRINT NEXTEL AT&T LOCAL NATIONSLINE MNRVMDMOXFX HGTWMDHGDS0 FRDRMDDXCM1 MNRVMDMODS1 FRDRMDFRTMD 240-403 CAVALIER TELEPHONE COMCAST DIGITAL PHONE HRNDVA13DS0 ALXNVAGBPS1 240-489 XO COMMUNICATIONS INC DSL.NET LEVEL 3 COMCAST DIGITAL PHONE WASHDCCZDS0 VINNVAGX0MD RSTNVA91DS0 ALXNVAGBPS0 WASHDCCZDS1 240-260 XO COMMUNICATIONS WASHDCRKDS3 240-325 CORETEL - MD DMSCMDAGDS0 240-507 VERIZON WIRELESS US LEC T-MOBILE ANJTMDAHCM2 TYCRVA03DS0 BTVLMD12CM1 240-899 T-MOBILE BTVLMD12CMA 240-788 LEVEL 3 COMCAST DIGITAL PHONE WASHDCRKDS2 ALXNVAGBPS1 240-696 LEVEL 3 RSTNVA91DS0 240-370 SPRINT PCS BTVLMDCKCM5 240-699 VERIZON MARYLAND NATIONSLINE BCTWMDBTRS1 FRDRMDFRTMD 240-295 CAVALIER TELEPHONE VERIZON MARYLAND COMCAST DIGITAL PHONE HRNDVA13DS0 LARLMDLRDS0 ALXNVAGBPS1 240-833 XO COMMUNICATIONS INC COMCAST LONG DISTANCE WASHDCCZDS0 CHCHMDBE7MD 240-455 PAETEC COMMUNICATIONS SPRINT NEXTEL LEVEL 3 COMCAST DIGITAL PHONE PAETEC COMMUNICATIONS STNGVA08DS0 SLSPMDEJCM1 RSTNVA91DS0 ALXNVAGBPS1 240-381 AT&T MOBILITY BTVLMD18GT0 240-285 VERIZON WIRELESS FRDRMDBACM1 240-321 U.S. CELLULAR AT&T MOBILITY BANDWIDTH.COM CMLDMDCM5MD MNRVMDMOXFX HGTWMDHGDMD 240-213 GLOBAL NAPS RSTNVA31DS0 240-776 LEVEL 3 COMCAST DIGITAL PHONE VERIZON ACCESS TRANSMISSION SERVICES LEVEL 3 WASHDCRKDS2 MNSSVAKQPS0 WASHDCINDS0 RSTNVA91DS0 240-446 VERIZON WIRELESS FRDRMDBACM1 240-778 XO COMMUNICATIONS INC VERIZON WIRELESS CBEYOND T-MOBILE WASHDCCZDS0 ANJTMDAHCM2 WASHDCMTPS0 BTVLMD12CM9 240-821 T-MOBILE BROADVIEW NETWORKS LEVEL 3 SPRINT NEXTEL BTVLMD12CMA SLSPMDBCDS0 RSTNVA91DS0 SLSPMDEJCM1 240-481 T-MOBILE BTVLMD12CMA 240-317 STARPOWER COMMUNICATIONS LLC T-MOBILE LEVEL 3 RNK INC IDT AMERICA XO COMMUNICATIONS INC BANDWIDTH.COM LNHMMDADDS0 BTVLMD12CMA RSTNVA91DS0 WASHDCSWXJZ LNTWMDAXPS0 WASHDCCZDS0 WASHDCDP8MD 240-291 AT&T MOBILITY T-MOBILE LEVEL 3 MNRVMDMOXFX FRDRMDFRKMD IJVLMD01DS0 240-356 LEVEL 3 NATIONSLINE YMAX COMMUNICATIONS FRDRMDFRJMD FRDRMDFRTMD FRDRMDLH7MD 240-457 VERIZON WIRELESS T-MOBILE BANDWIDTH.COM FRDRMDBACM1 FRDRMDFRKMD HGTWMDHGDMD 240-212 CORETEL - MD MTARMDSD00T 240-288 NATIONSLINE AT&T LOCAL COMCAST DIGITAL PHONE FRDRMDFRTMD MNRVMDMODS1 FRDRMDFRX1X 240-744 LEVEL 3 SPRINT NEXTEL SPRINT PCS WASHDCRKDS2 SLSPMDEJCM1 BTVLMDCKCM5 240-725 VERIZON MARYLAND LXPKMDLXDS0 240-685 GLOBAL CROSSING LOCAL SERVICES INC RNK INC WASJDCDCDS0 WASHDCSWXJZ 240-514 US LEC TYCRVA03DS0 240-418 SPRINT PCS BTVLMDCKCM5 240-216 SPRINT NEXTEL SLSPMDEJCM1 240-231 CORETEL - MD MTARMDSD00T 240-376 GLOBAL NAPS RSTNVA31DS0 240-275 CORETEL - MD MTARMDSD00T 240-888 AT&T MOBILITY BTVLMD18GT0 240-354 SPRINT PCS BTVLMDCKCM3 240-786 LEVEL 3 VERIZON WIRELESS COMCAST DIGITAL PHONE WASHDCRKDS2 ANJTMDAHCM2 ALXNVAGBPS0 240-221 VERIZON MARYLAND DSL.NET COMCAST DIGITAL PHONE GLOBAL TELECOM BROKERS RKVLMDMRDS0 VINNVAGX0MD ALXNVAGBPS0 LARLMDCCDS0 240-687 VERIZON WIRELESS ANJTMDAHCM2 240-529 VERIZON MARYLAND AT&T MOBILITY SPRINT NEXTEL FRDRMDFRDS1 MNRVMDMOXFX FRDRMDDXCM1 240-997 VERIZON WIRELESS ANJTMDAHCM2 240-273 LEVEL 3 DSL.NET T-MOBILE WASHDCRKDS2 VINNVAGX0MD BTVLMD12CM9 240-558 CBEYOND CAVALIER TELEPHONE COMCAST DIGITAL PHONE WASHDCMTPS0 HRNDVA13DS0 ALXNVAGBPS1 240-892 LEVEL 3 WASHDCRKDS2 240-671 SPRINT NEXTEL SPRINT PCS AT&T LONG DISTANCE SLSPMDEJCM1 BTVLMDCKCM5 WASHDC98DS0 240-245 BANDWIDTH.COM ONE COMMUNICATIONS COMCAST DIGITAL PHONE STARPOWER COMMUNICATIONS LLC WASHDCDP8MD WASHDCMTX7X MNSSVAKQPS0 ALXNVAGBPS0 LNHMMDADDS0 240-818 VERIZON MARYLAND VERIZON WIRELESS SMBGMDSMRS0 FRDRMDBACM1 240-472 AT&T MOBILITY BTVLMD18GT0 240-631 VERIZON MARYLAND GTBGMDGBPS0 240-465 GLOBAL NAPS RSTNVA31DS0 240-487 US LEC GLOBAL TELECOM BROKERS COMCAST DIGITAL PHONE BROADVIEW NETWORKS DSL.NET BANDWIDTH.COM TYCRVA03DS0 LARLMDCCDS0 ALXNVAGBPS0 SLSPMDBCDS0 VINNVAGX0MD WASHDCDP8MD 240-335 CAVALIER TELEPHONE HRNDVA13DS0 240-755 COMCAST DIGITAL PHONE T-MOBILE WHMRMDATPS0 BLTMMDCH40Z 240-434 LEVEL 3 VERIZON WIRELESS WASHDCRKDS2 WASHDCSWXVY 240-857 LEVEL 3 WASHDCRKDS2 240-307 NATIONSLINE VERIZON ACCESS TRANSMISSION SERVICES AT&T LOCAL FRDRMDFRTMD FRDRMDFRLMD MNRVMDMOX2X 240-318 VERIZON MARYLAND COMCAST DIGITAL PHONE GLOBAL TELECOM BROKERS CLTNMDCLDS0 MNSSVAKQPS0 LARLMDCCDS0 240-747 CAVALIER TELEPHONE LEVEL 3 WASJDCDBDS1 RSTNVA91DS0 240-294 XO COMMUNICATIONS INC PAETEC COMMUNICATIONS VERIZON MARYLAND RNK INC COMCAST DIGITAL PHONE NATIONSLINE WASHDCCZDS0 WASHDCSWXCY LARLMDLRDS0 WASHDCSWXJZ ALXNVAGBPS1 WASHDC12DS5 240-252 AT&T MOBILITY LEVEL 3 BTVLMD18GT0 RSTNVA91DS0 240-581 T-MOBILE PAETEC COMMUNICATIONS VERIZON WIRELESS US LEC VERIZON MARYLAND LEVEL 3 BTVLMD12CMA WASHDCSWXCY ANJTMDAHCM2 TYCRVA03DS0 MRKKMDMKDS0 RSTNVA91DS0 240-546 US LEC TYCRVA03DS0 240-688 VERIZON WIRELESS T-MOBILE ADLPMDMTCM2 BTVLMD12CMA 240-371 GLOBAL NAPS RSTNVA31DS0 240-207 CAVALIER TELEPHONE DSL.NET BROADVIEW NETWORKS COMCAST DIGITAL PHONE LEVEL 3 RNK INC WASJDCDBDS1 VINNVAGX0MD SLSPMDBCDS0 ALXNVAGBPS0 RSTNVA91DS0 WASHDCSWXJZ 240-431 SPRINT PCS WASHDCMTVMD 240-508 SPRINT NEXTEL SLSPMDEJCM1 240-351 SPRINT PCS BTVLMDCKCM3 240-949 CAVALIER TELEPHONE LEVEL 3 WASJDCDBDS1 RSTNVA91DS0 240-561 VERIZON WIRELESS LEVEL 3 BANDWIDTH.COM WASHDCSWXVY MCLNVA23DS4 WASHDCDP8MD 240-839 VERIZON WIRELESS T-MOBILE CBEYOND COMCAST DIGITAL PHONE ADLPMDMTCM2 BTVLMD12CMA WASHDCMTPS0 ALXNVAGBPS0 240-327 CORETEL - MD DMSCMDAGDS0 240-384 GLOBAL NAPS RSTNVA31DS0 240-646 CAVALIER TELEPHONE T-MOBILE WASJDCDBDS1 BTVLMD12CMA 240-375 SPRINT NEXTEL SLSPMDEJCM1 240-880 LEVEL 3 YMAX COMMUNICATIONS WASHDCRKDS2 WASLDCRGDS0 240-602 SPRINT PCS BTVLMDCKCM3 240-350 SPRINT PCS BTVLMDCKCM3 240-276 VERIZON MARYLAND GTBGMDGBPS0 RKVLMDRVDS1 240-331 GLOBAL NAPS RSTNVA31DS0 240-289 CAVALIER TELEPHONE LEVEL 3 T-MOBILE HRNDVA13DS0 RSTNVA91DS0 BTVLMD12CM9 240-536 GLOBAL NAPS RSTNVA31DS0 240-898 LEVEL 3 T-MOBILE WASHDCRKDS2 BTVLMD12CMA 240-494 CAVALIER TELEPHONE AT&T MOBILITY WASJDCDBDS1 BTVLMD18GT0 240-305 SPRINT PCS BTVLMDCKCM3 240-485 US LEC AT&T MOBILITY TYCRVA03DS0 BTVLMD18GT0 240-355 SPRINT PCS BTVLMDCKCM3 240-236 VERIZON MARYLAND FRDRMDFRDS1 240-702 CRICKET COMMUNICATIONS STNHVAABGT0 240-399 XO COMMUNICATIONS INC WASHDCCZDS0 240-601 SPRINT PCS BTVLMDCKCM3 240-845 XO COMMUNICATIONS INC WASHDCCZDS0 240-396 GLOBAL CROSSING LOCAL SERVICES INC SPRINT NEXTEL COMCAST DIGITAL PHONE T-MOBILE WASJDCDCDS0 SLSPMDEJCM1 ALXNVAGBPS0 BTVLMD12CMA 240-440 CRICKET COMMUNICATIONS FRDRMDFRX8X 240-469 T-MOBILE LEVEL 3 YMAX COMMUNICATIONS SPRINT AT&T MOBILITY SPRINT PCS FRDRMDFRKMD IJVLMD01DS0 FRDRMDLH7MD MRBGWVBUZMD MNRVMDMOXFX HGTWMD533MD 240-255 GLOBAL NAPS RSTNVA31DS0 240-681 NATIONSLINE LEVEL 3 COMCAST DIGITAL PHONE ATX TELECOMMUNICATIONS SERVICES BANDWIDTH.COM WASHDC12DS5 RSTNVA91DS0 MNSSVAKQPS0 WASHDC091MD WASHDCDP8MD 240-837 XO COMMUNICATIONS INC WASHDCCZDS0 240-846 XO COMMUNICATIONS INC WASHDCCZDS0 240-766 XO COMMUNICATIONS INC RNK INC LEVEL 3 WASHDCCZDS0 WASHDCSWXJZ RSTNVA91DS0 240-643 T-MOBILE BTVLMD12CMA 240-395 CAVALIER TELEPHONE SPRINT NEXTEL HRNDVA13DS0 SLSPMDEJCM1 240-498 SPRINT PCS BTVLMDCKCM5 240-253 GLOBAL CROSSING LOCAL SERVICES INC COMCAST DIGITAL PHONE T-MOBILE WASJDCDCDS0 MNSSVAKQPS0 BTVLMD12CM9 240-352 GLOBAL NAPS RSTNVA31DS0 240-632 VERIZON MARYLAND GTBGMDGBPS0 240-219 GLOBAL NAPS RSTNVA31DS0 240-764 XO COMMUNICATIONS INC LEVEL 3 COMCAST DIGITAL PHONE WASHDCCZDS0 RSTNVA91DS0 ALXNVAGBPS1 240-414 GLOBAL NAPS RSTNVA31DS0 240-678 VERIZON WIRELESS SPRINT NEXTEL ANJTMDAHCM2 SLSPMDEJCM1 240-527 T-MOBILE AT&T MOBILITY VERIZON MARYLAND SPRINT PCS FRDRMDFRKMD MNRVMDMOXFX HGTWMDHGDS0 HGTWMD533MD 240-284 NATIONSLINE IDT AMERICA BANDWIDTH.COM LEVEL 3 FRDRMDFRTMD CMLDMDCH0MD HGTWMDHGDMD FRDRMDFRJMD 240-603 SPRINT PCS BTVLMDCKCM3 240-206 XO COMMUNICATIONS INC DSL.NET RNK INC LEVEL 3 VERIZON BUSINESS COMCAST DIGITAL PHONE WASHDCCZDS0 VINNVAGX0MD WASHDCSWXJZ RSTNVA91DS0 RSTNVABHDS3 MNSSVAKQPS0 240-453 VERIZON MARYLAND RKVLMDRVDS1 240-605 SPRINT PCS BTVLMDCKCM3 240-433 CAVALIER TELEPHONE RNK INC HRNDVA13DS0 WASHDCSWXJZ 240-229 LEVEL 3 SPRINT NEXTEL WASHDCRKDS2 SLSPMDEJCM1 240-308 AT&T MOBILITY LEVEL 3 VERIZON ACCESS TRANSMISSION SERVICES BTVLMD18GT0 RSTNVA91DS0 WASHDCINDS0 240-390 CAVALIER TELEPHONE XO COMMUNICATIONS INC HRNDVA13DS0 WASHDCCZDS1 240-237 T-MOBILE US LEC NATIONSLINE TELEPORT COMMUNICATIONS GROUP SPRINT NEXTEL IDT AMERICA BTVLMD12CMA TYCRVA03DS0 WASHDC12DS5 WASHDCDTDS1 SLSPMDEJCM1 LNTWMDAXPS0 240-345 COMCAST DIGITAL PHONE LEVEL 3 VERIZON BUSINESS YMAX COMMUNICATIONS WHMRMDATPS0 BLTMMDSNDS1 BLTOMDKHDS0 BLTMMDSNDS6 BLTMMDSN6MD 240-233 TELEPORT COMMUNICATIONS GROUP US LEC LEVEL 3 COMCAST DIGITAL PHONE CORETEL - MD WASHDCTTDS0 TYCRVA03DS0 RSTNVA91DS0 MNSSVAKQPS0 DMSCMDAGDS1 240-378 CORETEL - MD MTARMDSD00T 240-441 T-MOBILE BTVLMD12CM9 240-682 VERIZON WIRELESS STARPOWER COMMUNICATIONS LLC WASHDCSWXVY LNHMMDADDS0 240-597 GLOBAL NAPS RSTNVA31DS0 240-299 SPRINT NEXTEL SLSPMDEJCM1 240-334 GLOBAL CROSSING LOCAL SERVICES INC WASJDCDCDS0 240-228 VERIZON MARYLAND LARLMDLRDS0 240-545 US LEC RNK INC TYCRVA03DS0 WASHDCSWXJZ 240-505 T-MOBILE BTVLMD12CMA 240-417 SPRINT NEXTEL SLSPMDEJCM1 240-767 CAVALIER TELEPHONE LEVEL 3 GLOBAL TELECOM BROKERS WASJDCDBDS1 RSTNVA91DS0 LARLMDCCDS0 240-499 US LEC VERIZON WIRELESS COMCAST DIGITAL PHONE TYCRVA03DS0 ANJTMDAHCM2 ALXNVAGBPS0 240-404 XO COMMUNICATIONS INC VERIZON MARYLAND AT&T MOBILITY WASHDCCZDS0 GMTWMDGNDS0 BTVLMD18GT0 240-379 VERIZON MARYLAND FRDRMDFRDS1 240-515 AT&T MOBILITY SPRINT NEXTEL BTVLMD18GT0 SLSPMDEJCM1 240-247 XO COMMUNICATIONS AT&T MOBILITY WASHDCRKDS3 BTVLMD18GT0 240-684 VERIZON MARYLAND CLPKMDBWDS0 240-393 VERIZON WIRELESS LEVEL 3 AT&T MOBILITY ANJTMDAHCM2 RSTNVA91DS0 BTVLMD18GT0 240-266 GLOBAL NAPS RSTNVA31DS0 240-895 VERIZON MARYLAND VERIZON ACCESS TRANSMISSION SERVICES LXPKMDLXDS0 WASHDCINDS0 240-493 US LEC COMCAST DIGITAL PHONE LEVEL 3 TYCRVA03DS0 MNSSVAKQPS0 RSTNVA91DS0 240-525 GLOBAL NAPS RSTNVA31DS0 240-543 T-MOBILE SPRINT PCS BTVLMD12CMA BTVLMDCKCM5 240-832 SPRINT NEXTEL SLSPMDEJCM1 240-209 GLOBAL NAPS RSTNVA31DS0 240-329 LEVEL 3 AT&T MOBILITY FIBERNET SPRINT PCS FRDRMDFRJMD MNRVMDMOXFX MRBGWVBUHPA HGTWMD533MD 240-893 AT&T MOBILITY BTVLMD18GT0 240-516 US LEC XO COMMUNICATIONS INC BANDWIDTH.COM TYCRVA03DS0 WASHDCCZDS1 WASHDCDP8MD 240-475 AT&T MOBILITY BTVLMD18GT0 240-342 DSL.NET NATIONSLINE COMCAST DIGITAL PHONE LEVEL 3 RNK INC VERIZON BUSINESS BANDWIDTH.COM STARPOWER COMMUNICATIONS LLC VINNVAGX0MD WASHDC12DS5 ALXNVAGBPS0 RSTNVA91DS0 WASHDCSWXJZ RSTNVABHDS3 WASHDCDP8MD LNHMMDADDS0 240-337 GLOBAL NAPS RSTNVA31DS0 240-559 XO COMMUNICATIONS WASHDCRKDS3 240-398 SPRINT NEXTEL LEVEL 3 NATIONSLINE SLSPMDEJCM1 RSTNVA91DS0 WASHDC12DS5 240-652 XO COMMUNICATIONS INC WASHDCCZDS0 WASHDCCZDS1 240-369 CORETEL - MD MTARMDSD00T 240-423 T-MOBILE BTVLMD12CMA 240-279 CORETEL - MD DMSCMDAGGT0 240-654 LEVEL 3 AT&T MOBILITY COMCAST DIGITAL PHONE YMAX COMMUNICATIONS RSTNVA91DS0 BTVLMD18GT0 ALXNVAGBPS1 WASLDCRGDS0 240-929 CAVALIER TELEPHONE WASJDCDBDS1 240-464 SPRINT NEXTEL T-MOBILE SLSPMDEJCM1 BTVLMD12CMA 240-261 GLOBAL NAPS RSTNVA31DS0 240-248 GLOBAL NAPS RSTNVA31DS0 240-779 CAVALIER TELEPHONE WASJDCDBDS1 240-882 SPRINT NEXTEL SLSPMDEJCM1 240-421 T-MOBILE BTVLMD12CM9 240-205 VERIZON WIRELESS AT&T MOBILITY LEVEL 3 ANJTMDAHCM2 BTVLMD18GT0 RSTNVA91DS0 240-426 SPRINT PCS BTVLMDCKCM5 240-477 AT&T MOBILITY BROADVIEW NETWORKS COMCAST DIGITAL PHONE BTVLMD18GT0 SLSPMDBCDS0 ALXNVAGBPS0 240-542 US LEC TYCRVA03DS0 240-522 IDT AMERICA SPRINT PCS U.S. CELLULAR AT&T MOBILITY CMLDMDCH0MD CMLDMDCM4MD CMLDMDCM5MD MNRVMDMOXFX 240-691 GLOBAL CROSSING LOCAL SERVICES INC VERIZON WIRELESS WASJDCDCDS0 ADLPMDMTCM2 240-616 VERIZON BUSINESS RSTNVABHDS3 240-322 CORETEL - MD MTARMDSD00T 240-672 VERIZON WIRELESS NATIONSLINE ANJTMDAHCM2 LARLMDEHDS1 240-965 PAETEC COMMUNICATIONS COMCAST DIGITAL PHONE CHCHMDBE6MD ALXNVAGBPS1 240-731 AT&T MOBILITY BTVLMD18GT0 240-286 SPRINT NEXTEL SLSPMDEJCM1 240-225 CORETEL - MD MTARMDSD00T 240-723 VERIZON WIRELESS SPRINT NEXTEL ADLPMDMTCM2 SLSPMDEJCM1 240-241 DSL.NET XO COMMUNICATIONS INC LEVEL 3 STARPOWER COMMUNICATIONS LLC VINNVAGX0MD WASHDCCZDS1 RSTNVA91DS0 LNHMMDADDS0 240-644 XO COMMUNICATIONS INC T-MOBILE SPRINT PCS WASHDCCZDS0 BTVLMD12CMA BTVLMDCKCM5 240-843 XO COMMUNICATIONS BLTMMDCDDS0 240-365 BALTIMORE-WASHINGTON TELEPHONE COMPANY LARLMDEHDS1 240-388 SPRINT NEXTEL AT&T MOBILITY NATIONSLINE SLSPMDEJCM1 BTVLMD18GT0 WASHDC12DS5 240-427 XO COMMUNICATIONS INC US LEC SPRINT NEXTEL VERIZON WIRELESS WASHDCCZDS0 TYCRVA03DS0 SLSPMDEJCM1 WASHDCSWXVY 240-287 CORETEL - MD MTARMDSD00T 240-439 VERIZON WIRELESS T-MOBILE VERIZON MARYLAND LEVEL 3 FRDRMDBACM1 FRDRMDFRKMD FRDRMDFRDS1 FRDRMDFRJMD 240-560 XO COMMUNICATIONS INC NATIONSLINE LEVEL 3 COMCAST DIGITAL PHONE WASHDCCZDS0 WASHDC12DS5 RSTNVA91DS0 ALXNVAGBPS0 ALXNVAGBPS1 240-386 VERIZON MARYLAND T-MOBILE COMCAST DIGITAL PHONE GTBGMDGBPS0 BTVLMD12CM9 ALXNVAGBPS1 240-704 CRICKET COMMUNICATIONS STNHVAABGT0 240-620 VERIZON BUSINESS VERIZON WIRELESS RSTNVABHDS3 ANJTMDAHCM2 240-883 LEVEL 3 T-MOBILE WASHDCRKDS2 BTVLMD12CMA 240-544 US LEC GLOBAL TELECOM BROKERS TYCRVA03DS0 LARLMDCCDS0 240-333 CAVALIER TELEPHONE WASJDCDBDS1 240-392 DSL.NET COMCAST DIGITAL PHONE LEVEL 3 STARPOWER COMMUNICATIONS LLC VINNVAGX0MD ALXNVAGBPS0 RSTNVA91DS0 LNHMMDADDS0 240-383 AT&T MOBILITY XO COMMUNICATIONS INC YMAX COMMUNICATIONS NATIONSLINE BTVLMD18GT0 WASHDCCZDS1 WASLDCRGDS0 WASHDC12DS5 240-938 T-MOBILE BTVLMD12CMA 240-787 LEVEL 3 WASHDCRKDS2 240-580 SPRINT NEXTEL LEVEL 3 BANDWIDTH.COM CMLDMDCM3MD FRDRMDFRJMD HGTWMDHGDMD 240-567 VERIZON MARYLAND RKVLMDRVDS1 240-848 SPRINT NEXTEL SLSPMDEJCM1 240-230 GLOBAL CROSSING LOCAL SERVICES INC NATIONSLINE LEVEL 3 BANDWIDTH.COM WASJDCDCDS0 WASHDC12DS5 RSTNVA91DS0 WASHDCDP8MD 240-865 COMCAST DIGITAL PHONE ONE COMMUNICATIONS CORETEL - MD LEVEL 3 PAETEC COMMUNICATIONS LEVEL 3 BROADVIEW NETWORKS VERIZON ACCESS TRANSMISSION SERVICES BALTIMORE-WASHINGTON TELEPHONE COMPANY WHMRMDATPS1 BLTMMDCH14Z BLTMMD91DS0 BLTMMDSNDS1 CHCHMDBE6MD ANNPMDAN6MD PIVLMDPKFMD BLTMMDDNDS0 LARLMDEH00T 240-686 VERIZON MARYLAND YMAX COMMUNICATIONS GMTWMDGNDS0 WASLDCRGDS0 240-864 CAVALIER TELEPHONE WASJDCDBDS1 240-466 BANDWIDTH.COM RNK INC GLOBAL NAPS WASHDCDP8MD WASHDCSWXJZ RSTNVA31DS0 240-460 AT&T MOBILITY BTVLMD18GT0 240-483 COMCAST LONG DISTANCE SPRINT PCS LEVEL 3 CHCHMDBE7MD BTVLMDCKCM5 RSTNVA91DS0 ALXNVAGBPS1 240-476 T-MOBILE BTVLMD12CMA 240-310 U.S. CELLULAR US LEC AT&T MOBILITY T-MOBILE BANDWIDTH.COM FRDRMDFRNMD FRDRMDFRPMD MNRVMDMOXFX FRDRMDFRKMD HGTWMDHGDMD 240-320 CAVALIER TELEPHONE VERIZON WIRELESS WASJDCDBDS1 WASHDCSWXVY 240-492 US LEC LEVEL 3 T-MOBILE TYCRVA03DS0 RSTNVA91DS0 BTVLMD12CMA 240-645 XO COMMUNICATIONS INC T-MOBILE AT&T MOBILITY SPRINT NEXTEL WASHDCCZDS0 BTVLMD12CMA BTVLMD18GT0 SLSPMDEJCM1 240-413 T-MOBILE BTVLMD12CMA

Block Name Assigned To Switches 240-512 VERIZON ACCESS TRANSMISSION SERVICES VERIZON BUSINESS CORETEL - MD BLTMMDDNDS0 BLTOMDKHDS0 BLTMMD91DS0 240-626 SPRINT PCS VERIZON MARYLAND FRDRMDFRCMD FRDRMDFRDS1 240-715 GLOBAL CROSSING LOCAL SERVICES INC T-MOBILE WASJDCDCDS0 BTVLMD12CM9 240-447 AT&T MOBILITY BTVLMD18GT0 240-552 CRICKET COMMUNICATIONS STNHVAABGT0 240-533 TELEPORT COMMUNICATIONS GROUP T-MOBILE SPRINT NEXTEL GLOBAL TELECOM BROKERS WASHDCDTDS1 BTVLMD12CMA SLSPMDEJCM1 LARLMDCCDS0 240-425 DSL.NET T-MOBILE VINNVAGX1MD BTVLMD12CMA 240-406 CRICKET COMMUNICATIONS STNHVAABGT0 240-324 YMAX COMMUNICATIONS BLTMMDSNDS6 240-526 GLOBAL NAPS RSTNVA31DS0 240-298 VERIZON WIRELESS WASHDCSWXVY 240-338 VERIZON WIRELESS AT&T MOBILITY ANJTMDAHCM2 BTVLMD18GT0 240-419 VERIZON WIRELESS COMCAST DIGITAL PHONE CBEYOND WASHDCSWXVY MNSSVAKQPS0 WASHDCMTPS0 240-619 T-MOBILE ONE COMMUNICATIONS COMCAST DIGITAL PHONE VERIZON WIRELESS XO COMMUNICATIONS INC VERIZON BUSINESS BTVLMD12CMA WASHDCMTX7X ALXNVAGBPS1 ALXNVAGBPS0 ADLPMDMTCM2 WASHDCCZDS1 RSTNVABHDS3 240-232 LEVEL 3 WASHDCRKDS2 240-479 VERIZON WIRELESS PAETEC COMMUNICATIONS YMAX COMMUNICATIONS TW TELECOM T-MOBILE SPRINT PCS BANDWIDTH.COM ANJTMDAHCM2 CHCHMDBE6MD WASLDCRGDS0 LARLMDCCDC0 BTVLMD12CMA BTVLMDCKCM5 WASHDCDP8MD 240-486 T-MOBILE BTVLMD12CM9 240-478 T-MOBILE AT&T MOBILITY LEVEL 3 VERIZON WIRELESS BTVLMD12CMA BTVLMD18GT0 RSTNVA91DS0 ADLPMDMTCM2 240-773 VERIZON MARYLAND RKVLMDRVDS1 240-314 VERIZON MARYLAND T-MOBILE RKVLMDRVDS1 BTVLMD12CM9 240-640 CRICKET COMMUNICATIONS STNHVAABGT0 240-842 XO COMMUNICATIONS BLTMMDCDDS0 240-575 T-MOBILE LEVEL 3 VERIZON WIRELESS US LEC AT&T MOBILITY COMCAST DIGITAL PHONE FRDRMDFRKMD FRDRMDFRJMD FRDRMDFRXMD FRDRMDBACM1 FRDRMDFRPMD MNRVMDMOXFX FRDRMDFRX1X 240-258 CORETEL - MD US LEC LEVEL 3 RNK INC IDT AMERICA BANDWIDTH.COM TELEPORT COMMUNICATIONS GROUP DMSCMDAGDS1 TYCRVA03DS0 RSTNVA91DS0 WASHDCSWXJZ LNTWMDAXPS0 WASHDCDP8MD WASHDCTTDS0 240-280 XO COMMUNICATIONS INC COMCAST DIGITAL PHONE VERIZON BUSINESS CRICKET COMMUNICATIONS COMCAST LONG DISTANCE WASHDCCZDS0 ALXNVAGBPS0 RSTNVABHDS3 STNHVAABGT0 ALXNVAGBPS1 CHCHMDBE7MD 240-306 XO COMMUNICATIONS WASHDCRKDS3 240-405 SPRINT NEXTEL US LEC VERIZON WIRELESS FRDRMDDXCM1 FRDRMDFRPMD FRDRMDBACM1 240-220 GLOBAL NAPS RSTNVA31DS0 240-863 TW TELECOM VERIZON WIRELESS COMCAST DIGITAL PHONE SPRINT NEXTEL LARLMDCCDC0 ADLPMDMTCM2 ALXNVAGBPS0 SLSPMDEJCM1 240-912 US LEC COMCAST DIGITAL PHONE TYCRVA03DS0 ALXNVAGBPS0 240-349 GLOBAL CROSSING LOCAL SERVICES INC COMCAST DIGITAL PHONE XO COMMUNICATIONS INC RNK INC WASJDCDCDS0 MNSSVAKQPS0 WASHDCCZDS0 WASHDCSWXJZ 240-363 GLOBAL NAPS RSTNVA31DS0 240-374 GLOBAL CROSSING LOCAL SERVICES INC T-MOBILE VERIZON WIRELESS WASJDCDCDS0 BTVLMD12CMA ANJTMDAHCM2 240-339 CAVALIER TELEPHONE COMCAST DIGITAL PHONE CBEYOND BANDWIDTH.COM DSL.NET WASJDCDBDS1 MNSSVAKQPS0 WASHDCMTPS0 WASHDCDP8MD VINNVAGX0MD 240-520 AT&T MOBILITY SPRINT PCS MNRVMDMOXFX HGTWMD533MD 240-242 STARPOWER COMMUNICATIONS LLC COMCAST DIGITAL PHONE ONE 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