Subnet CIDR Pro vs 42 PDF Editor

Subnet CIDR Pro is a focused, offline-first network calculator and VLSM planner built for network engineers, sysadmins, homelab users, and IT students. From quick /30 interface checks to full multi-VLAN allocation plans, get accurate IPv4 subnetting and address tooling directly on your iPhone and iPad—with zero tracking, zero ads, and 100% local calculation. IPv4 & CIDR CALCULATOR • Full Range Support: Calculate any prefix from /0 to /32 • Essential Telemetry: Network, broadcast, subnet mask, wildcard mask, and usable host ranges • Host Capacity: Instant breakdown of total addresses vs. usable host capacity • Modern Link Handling: Full support for /31 point-to-point links (RFC 3021) and /32 host routes • Binary Inspection: Visualize network vs. host bits in clear binary layout • Mask Conversion: Seamless conversion between CIDR prefixes, subnet masks, and wildcard masks • One-Tap Copy: Copy individual values or complete formatted network summaries VLSM NETWORK PLANNING • Requirement-Driven Allocation: Subnet a parent IPv4 block based on exact host requirements • VLAN & Naming: Assign custom network labels and VLAN IDs per subnet • Growth Headroom: Configurable growth reserve percentage per allocation • Gateway Reservation: Optional automatic reservation for default gateway addresses • Space Optimization: View allocated CIDRs alongside remaining unallocated blocks • Overflow Warnings: Instant alerts when requirements exceed parent network capacity ADDRESS TOOLS & IP MATH • Subnet Compare: Test two subnets for containment, overlap, equality, or isolation • IP Membership: Verify instantly whether an IPv4 address belongs to a target network • Range to CIDR: Convert arbitrary start/end IP ranges into minimal exact CIDR blocks • Subnet Splitting: Break down any network into equal-sized child subnets • Supernetting: Summarize adjacent or overlapping subnets into clean aggregation blocks PROJECT WORKSPACE & EXPORT • Project History: Save named planning projects, reopen, rename, or duplicate anytime • Auto-Save: Automatically preserves your current planning draft • Data Export: Export complete subnet plans and available address blocks as CSV • Clipboard Sharing: One-tap copy for formatted plain-text documentation CIDR QUICK REFERENCE TABLE • Interactive reference matrix for all prefixes (/0 to /32) • Searchable by prefix, dotted-decimal mask, wildcard mask, or usable host count • Fast reference copying for switch and firewall configuration DESIGNED FOR iOS & iPadOS • High-contrast dark interface tailored for server rooms and night operations • Adaptive iPad workspace: side-by-side inputs, live results, and wide allocation tables • Localized in 13 languages: English, Simplified & Traditional Chinese, German, French, Japanese, Korean, Italian, Spanish, Brazilian Portuguese, Arabic, Dutch, and Turkish 100% OFFLINE & PRIVATE • Calculations run purely on your device • No account required, no telemetry SDKs, no ads, and no in-app purchases Terms of Use: https://subnet.opshome.run/terms/ Privacy Policy: https://subnet.opshome.run/privacy/ Support: https://subnet.opshome.run/support/

42 PDF Editor is a PDF reader and editor for iPhone and iPad. Open a PDF from the Files app, iCloud Drive or any other provider, mark it up, fill it in, sign it, stamp it and rearrange its pages, then save it back to the same file or to a new copy. Everything happens on your device, with Apple's own PDFKit. There is no account and nothing is uploaded. Most of what people need to do to a PDF is small: sign a form, fill in a few fields, fix a typo, take out a page, add the scan of a receipt. 42 PDF Editor puts those jobs on the phone you already have with you, and shows every change on the page as you make it. START WITH A TASK The Home screen lists the jobs: Sign, Fill & Stamp, Scan to Text, Compress, Page Numbers, Split, Edit Text and To Images. Pick one, then the PDF, and the editor opens straight into it. MARK UP Highlight, underline and strike through text. Draw with a pen or highlighter, by finger or Apple Pencil, with smooth strokes, and add shapes, arrows and text boxes. Tap any markup to move or resize it with its corner handles, change its colour, weight or opacity, duplicate or delete it, and undo or redo every change. EDIT TEXT Tap a line and retype it. The font, size and colours are matched to the original, and the page shows the result as you type. Change it or undo it later. FILL, SIGN AND STAMP Type into a PDF's form fields, or drop a check, cross, dot, today's date or saved text (your name, email, address) onto a flat form with one tap. Draw a signature once and keep it on your device, then place and resize it on any page; it stays sharp because it is written as vector ink. Add stamps such as Approved, Paid, Received or Draft, or make your own, with an optional date. Add logos and photos too. SCAN TO TEXT Scanned pages become searchable, selectable and editable with on-device text recognition. The page looks exactly the same; its words can now be found, highlighted, copied and retyped. PAGES Drag to reorder, rotate, duplicate or delete. Select several pages to extract them as a new PDF or export them as images. Split a document into files, add page numbers, and crop pages by hand or automatically to their content. Insert blank pages, pages from another PDF or Word file, scans or photos. SCAN AND CREATE Scan paper with the camera, make a PDF from photos, start a blank PDF, or merge several PDFs into one. PDF AND WORD Turn a Word (.docx) file into a PDF, keeping its styles, lists, tables, links, pictures and page size. Turn a PDF into a Word document with editable text, with scanned pages read by on-device text recognition, or with a picture of each page when the look matters most. WATERMARKS, PASSWORDS AND FILE SIZE Add a text or image watermark with your choice of opacity, angle and position. Open password-protected PDFs, and add, change or remove a password. Make a smaller version of a PDF: pictures are compressed, text and drawings stay sharp. SAVE AND SHARE Save in place, Save a Copy, Save a Flattened Copy with the markup drawn into the pages, Share, Print, or export pages as PNG or JPEG. Open in 42 PDF Editor from the Files app and the share sheet. PRIVATE No account, no ads, no analytics and no servers. Your documents, signatures and saved text never leave your device unless you share them. Good to know: Edit Text and Whiteout cover the original content and place new content on top. The original text is still inside the file, so they are not a way to redact a document.